diff options
Diffstat (limited to 'libpthread/linuxthreads/manager.c')
| -rw-r--r-- | libpthread/linuxthreads/manager.c | 829 |
1 files changed, 320 insertions, 509 deletions
diff --git a/libpthread/linuxthreads/manager.c b/libpthread/linuxthreads/manager.c index 3c5bee876..e4022f8ea 100644 --- a/libpthread/linuxthreads/manager.c +++ b/libpthread/linuxthreads/manager.c @@ -14,7 +14,7 @@ /* The "thread manager" thread: manages creation and termination of threads */ -#include <assert.h> +#include <features.h> #include <errno.h> #include <sched.h> #include <stddef.h> @@ -27,72 +27,77 @@ #include <sys/param.h> #include <sys/time.h> #include <sys/wait.h> /* for waitpid macros */ -#include <locale.h> /* for __uselocale */ -#include <resolv.h> /* for __resp */ #include "pthread.h" #include "internals.h" #include "spinlock.h" #include "restart.h" #include "semaphore.h" -#include <not-cancel.h> +#include "debug.h" /* PDEBUG, added by StS */ + +#ifndef THREAD_STACK_OFFSET +#define THREAD_STACK_OFFSET 0 +#endif + +/* poll() is not supported in kernel <= 2.0, therefore is __NR_poll is + * not available, we assume an old Linux kernel is in use and we will + * use select() instead. */ +#include <sys/syscall.h> +#ifndef __NR_poll +# define USE_SELECT +#endif + +libpthread_hidden_proto(waitpid) +libpthread_hidden_proto(raise) + +/* Array of active threads. Entry 0 is reserved for the initial thread. */ +struct pthread_handle_struct __pthread_handles[PTHREAD_THREADS_MAX] = +{ { __LOCK_INITIALIZER, &__pthread_initial_thread, 0}, + { __LOCK_INITIALIZER, &__pthread_manager_thread, 0}, /* All NULLs */ }; /* For debugging purposes put the maximum number of threads in a variable. */ const int __linuxthreads_pthread_threads_max = PTHREAD_THREADS_MAX; -#ifndef THREAD_SELF /* Indicate whether at least one thread has a user-defined stack (if 1), or if all threads have stacks supplied by LinuxThreads (if 0). */ int __pthread_nonstandard_stacks; -#endif /* Number of active entries in __pthread_handles (used by gdb) */ -__volatile__ int __pthread_handles_num = 2; +volatile int __pthread_handles_num = 2; /* Whether to use debugger additional actions for thread creation (set to 1 by gdb) */ -__volatile__ int __pthread_threads_debug; +volatile int __pthread_threads_debug; /* Globally enabled events. */ -__volatile__ td_thr_events_t __pthread_threads_events; +volatile td_thr_events_t __pthread_threads_events; /* Pointer to thread descriptor with last event. */ -__volatile__ pthread_descr __pthread_last_event; - -static pthread_descr manager_thread; +volatile pthread_descr __pthread_last_event; /* Mapping from stack segment to thread descriptor. */ /* Stack segment numbers are also indices into the __pthread_handles array. */ /* Stack segment number 0 is reserved for the initial thread. */ -#if FLOATING_STACKS -# define thread_segment(seq) NULL -#else static __inline__ pthread_descr thread_segment(int seg) { -# ifdef _STACK_GROWS_UP - return (pthread_descr)(THREAD_STACK_START_ADDRESS + (seg - 1) * STACK_SIZE) - + 1; -# else return (pthread_descr)(THREAD_STACK_START_ADDRESS - (seg - 1) * STACK_SIZE) - 1; -# endif } -#endif /* Flag set in signal handler to record child termination */ -static __volatile__ int terminated_children; +static volatile int terminated_children = 0; /* Flag set when the initial thread is blocked on pthread_exit waiting for all other threads to terminate */ -static int main_thread_exiting; +static int main_thread_exiting = 0; /* Counter used to generate unique thread identifier. Thread identifier is pthread_threads_counter + segment. */ -static pthread_t pthread_threads_counter; +static pthread_t pthread_threads_counter = 0; /* Forward declarations */ @@ -102,54 +107,67 @@ static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr, int report_events, td_thr_events_t *event_maskp); static void pthread_handle_free(pthread_t th_id); -static void pthread_handle_exit(pthread_descr issuing_thread, int exitcode) - __attribute__ ((noreturn)); +static void pthread_handle_exit(pthread_descr issuing_thread, int exitcode) attribute_noreturn; static void pthread_reap_children(void); static void pthread_kill_all_threads(int sig, int main_thread_also); -static void pthread_for_each_thread(void *arg, - void (*fn)(void *, pthread_descr)); /* The server thread managing requests for thread creation and termination */ -int -__attribute__ ((noreturn)) -__pthread_manager(void *arg) +int attribute_noreturn __pthread_manager(void *arg) { - pthread_descr self = manager_thread = arg; - int reqfd = __pthread_manager_reader; + int reqfd = (int) (long int) arg; +#ifdef USE_SELECT + struct timeval tv; + fd_set fd; +#else struct pollfd ufd; +#endif sigset_t manager_mask; int n; struct pthread_request request; /* If we have special thread_self processing, initialize it. */ #ifdef INIT_THREAD_SELF - INIT_THREAD_SELF(self, 1); + INIT_THREAD_SELF(&__pthread_manager_thread, 1); #endif -#ifndef __UCLIBC_HAS_TLS__ /* Set the error variable. */ - self->p_errnop = &self->p_errno; - self->p_h_errnop = &self->p_h_errno; -#endif + __pthread_manager_thread.p_errnop = &__pthread_manager_thread.p_errno; + __pthread_manager_thread.p_h_errnop = &__pthread_manager_thread.p_h_errno; + +#ifdef __UCLIBC_HAS_XLOCALE__ + /* Initialize thread's locale to the global locale. */ + __pthread_manager_thread.locale = __global_locale; +#endif /* __UCLIBC_HAS_XLOCALE__ */ + /* Block all signals except __pthread_sig_cancel and SIGTRAP */ __sigfillset(&manager_mask); sigdelset(&manager_mask, __pthread_sig_cancel); /* for thread termination */ sigdelset(&manager_mask, SIGTRAP); /* for debugging purposes */ if (__pthread_threads_debug && __pthread_sig_debug > 0) - sigdelset(&manager_mask, __pthread_sig_debug); + sigdelset(&manager_mask, __pthread_sig_debug); sigprocmask(SIG_SETMASK, &manager_mask, NULL); /* Raise our priority to match that of main thread */ __pthread_manager_adjust_prio(__pthread_main_thread->p_priority); /* Synchronize debugging of the thread manager */ - n = TEMP_FAILURE_RETRY(read_not_cancel(reqfd, (char *)&request, - sizeof(request))); - ASSERT(n == sizeof(request) && request.req_kind == REQ_DEBUG); + n = TEMP_FAILURE_RETRY(read(reqfd, (char *)&request, + sizeof(request))); +#ifndef USE_SELECT ufd.fd = reqfd; ufd.events = POLLIN; +#endif /* Enter server loop */ while(1) { - n = __poll(&ufd, 1, 2000); - +#ifdef USE_SELECT + tv.tv_sec = 2; + tv.tv_usec = 0; + FD_ZERO (&fd); + FD_SET (reqfd, &fd); + n = select (reqfd + 1, &fd, NULL, NULL, &tv); +#else + PDEBUG("before poll\n"); + n = poll(&ufd, 1, 2000); + PDEBUG("after poll\n"); +#endif /* Check for termination of the main thread */ if (getppid() == 1) { pthread_kill_all_threads(SIGKILL, 0); @@ -161,20 +179,19 @@ __pthread_manager(void *arg) pthread_reap_children(); } /* Read and execute request */ - if (n == 1 && (ufd.revents & POLLIN)) { - n = TEMP_FAILURE_RETRY(read_not_cancel(reqfd, (char *)&request, - sizeof(request))); -#ifdef DEBUG - if (n < 0) { - char d[64]; - write(STDERR_FILENO, d, snprintf(d, sizeof(d), "*** read err %m\n")); - } else if (n != sizeof(request)) { - write(STDERR_FILENO, "*** short read in manager\n", 26); - } +#ifdef USE_SELECT + if (n == 1) +#else + if (n == 1 && (ufd.revents & POLLIN)) #endif + { + PDEBUG("before read\n"); + n = read(reqfd, (char *)&request, sizeof(request)); + PDEBUG("after read, n=%d\n", n); switch(request.req_kind) { case REQ_CREATE: + PDEBUG("got REQ_CREATE\n"); request.req_thread->p_retcode = pthread_handle_create((pthread_t *) &request.req_thread->p_retval, request.req_args.create.attr, @@ -182,19 +199,23 @@ __pthread_manager(void *arg) request.req_args.create.arg, &request.req_args.create.mask, request.req_thread->p_pid, - request.req_thread->p_report_events, - &request.req_thread->p_eventbuf.eventmask); + request.req_thread->p_report_events, + &request.req_thread->p_eventbuf.eventmask); + PDEBUG("restarting %p\n", request.req_thread); restart(request.req_thread); break; case REQ_FREE: - pthread_handle_free(request.req_args.free.thread_id); + PDEBUG("got REQ_FREE\n"); + pthread_handle_free(request.req_args.free.thread_id); break; case REQ_PROCESS_EXIT: + PDEBUG("got REQ_PROCESS_EXIT from %p, exit code = %d\n", + request.req_thread, request.req_args.exit.code); pthread_handle_exit(request.req_thread, request.req_args.exit.code); - /* NOTREACHED */ break; case REQ_MAIN_THREAD_EXIT: + PDEBUG("got REQ_MAIN_THREAD_EXIT\n"); main_thread_exiting = 1; /* Reap children in case all other threads died and the signal handler went off before we set main_thread_exiting to 1, and therefore did @@ -210,99 +231,81 @@ __pthread_manager(void *arg) } break; case REQ_POST: + PDEBUG("got REQ_POST\n"); sem_post(request.req_args.post); break; case REQ_DEBUG: + PDEBUG("got REQ_DEBUG\n"); /* Make gdb aware of new thread and gdb will restart the new thread when it is ready to handle the new thread. */ - if (__pthread_threads_debug && __pthread_sig_debug > 0) + if (__pthread_threads_debug && __pthread_sig_debug > 0) { + PDEBUG("about to call raise(__pthread_sig_debug)\n"); raise(__pthread_sig_debug); - break; + } case REQ_KICK: /* This is just a prod to get the manager to reap some threads right away, avoiding a potential delay at shutdown. */ break; - case REQ_FOR_EACH_THREAD: - pthread_for_each_thread(request.req_args.for_each.arg, - request.req_args.for_each.fn); - restart(request.req_thread); - break; } } } } -int __pthread_manager_event(void *arg) +int attribute_noreturn __pthread_manager_event(void *arg) { - pthread_descr self = arg; /* If we have special thread_self processing, initialize it. */ #ifdef INIT_THREAD_SELF - INIT_THREAD_SELF(self, 1); + INIT_THREAD_SELF(&__pthread_manager_thread, 1); #endif /* Get the lock the manager will free once all is correctly set up. */ - __pthread_lock (THREAD_GETMEM(self, p_lock), NULL); + __pthread_lock (THREAD_GETMEM((&__pthread_manager_thread), p_lock), NULL); /* Free it immediately. */ - __pthread_unlock (THREAD_GETMEM(self, p_lock)); + __pthread_unlock (THREAD_GETMEM((&__pthread_manager_thread), p_lock)); - return __pthread_manager(arg); + __pthread_manager(arg); } /* Process creation */ - static int -__attribute__ ((noreturn)) +attribute_noreturn pthread_start_thread(void *arg) { pthread_descr self = (pthread_descr) arg; struct pthread_request request; void * outcome; -#if HP_TIMING_AVAIL - hp_timing_t tmpclock; -#endif /* Initialize special thread_self processing, if any. */ #ifdef INIT_THREAD_SELF INIT_THREAD_SELF(self, self->p_nr); #endif -#if HP_TIMING_AVAIL - HP_TIMING_NOW (tmpclock); - THREAD_SETMEM (self, p_cpuclock_offset, tmpclock); -#endif + PDEBUG("\n"); /* Make sure our pid field is initialized, just in case we get there before our father has initialized it. */ - THREAD_SETMEM(self, p_pid, __getpid()); + THREAD_SETMEM(self, p_pid, getpid()); /* Initial signal mask is that of the creating thread. (Otherwise, we'd just inherit the mask of the thread manager.) */ sigprocmask(SIG_SETMASK, &self->p_start_args.mask, NULL); /* Set the scheduling policy and priority for the new thread, if needed */ if (THREAD_GETMEM(self, p_start_args.schedpolicy) >= 0) /* Explicit scheduling attributes were provided: apply them */ - __sched_setscheduler(THREAD_GETMEM(self, p_pid), + sched_setscheduler(THREAD_GETMEM(self, p_pid), THREAD_GETMEM(self, p_start_args.schedpolicy), &self->p_start_args.schedparam); - else if (manager_thread->p_priority > 0) + else if (__pthread_manager_thread.p_priority > 0) /* Default scheduling required, but thread manager runs in realtime scheduling: switch new thread to SCHED_OTHER policy */ { struct sched_param default_params; default_params.sched_priority = 0; - __sched_setscheduler(THREAD_GETMEM(self, p_pid), + sched_setscheduler(THREAD_GETMEM(self, p_pid), SCHED_OTHER, &default_params); } -#ifndef __UCLIBC_HAS_TLS__ - /* Initialize thread-locale current locale to point to the global one. - With __thread support, the variable's initializer takes care of this. */ - __uselocale (LC_GLOBAL_LOCALE); -#elif defined __UCLIBC_HAS_RESOLVER_SUPPORT__ - /* Initialize __resp. */ - __resp = &self->p_res; -#endif /* Make gdb aware of new thread */ if (__pthread_threads_debug && __pthread_sig_debug > 0) { request.req_thread = self; request.req_kind = REQ_DEBUG; - TEMP_FAILURE_RETRY(write_not_cancel(__pthread_manager_request, - (char *) &request, sizeof(request))); + TEMP_FAILURE_RETRY(write(__pthread_manager_request, + (char *) &request, sizeof(request))); suspend(self); } /* Run the thread code */ @@ -313,7 +316,7 @@ pthread_start_thread(void *arg) } static int -__attribute__ ((noreturn)) +attribute_noreturn pthread_start_thread_event(void *arg) { pthread_descr self = (pthread_descr) arg; @@ -323,7 +326,7 @@ pthread_start_thread_event(void *arg) #endif /* Make sure our pid field is initialized, just in case we get there before our father has initialized it. */ - THREAD_SETMEM(self, p_pid, __getpid()); + THREAD_SETMEM(self, p_pid, getpid()); /* Get the lock the manager will free once all is correctly set up. */ __pthread_lock (THREAD_GETMEM(self, p_lock), NULL); /* Free it immediately. */ @@ -333,250 +336,136 @@ pthread_start_thread_event(void *arg) pthread_start_thread (arg); } -#if defined __UCLIBC_HAS_TLS__ && !FLOATING_STACKS -# error "TLS can only work with floating stacks" -#endif - static int pthread_allocate_stack(const pthread_attr_t *attr, pthread_descr default_new_thread, int pagesize, - char ** out_new_thread, + pthread_descr * out_new_thread, char ** out_new_thread_bottom, char ** out_guardaddr, - size_t * out_guardsize, - size_t * out_stacksize) + size_t * out_guardsize) { pthread_descr new_thread; char * new_thread_bottom; char * guardaddr; size_t stacksize, guardsize; -#ifdef __UCLIBC_HAS_TLS__ - /* TLS cannot work with fixed thread descriptor addresses. */ - assert (default_new_thread == NULL); -#endif - if (attr != NULL && attr->__stackaddr_set) { -#ifdef _STACK_GROWS_UP /* The user provided a stack. */ -# ifdef __UCLIBC_HAS_TLS__ - /* This value is not needed. */ - new_thread = (pthread_descr) attr->__stackaddr; - new_thread_bottom = (char *) new_thread; -# else - new_thread = (pthread_descr) attr->__stackaddr; - new_thread_bottom = (char *) (new_thread + 1); -# endif - guardaddr = attr->__stackaddr + attr->__stacksize; - guardsize = 0; -#else - /* The user provided a stack. For now we interpret the supplied - address as 1 + the highest addr. in the stack segment. If a - separate register stack is needed, we place it at the low end - of the segment, relying on the associated stacksize to - determine the low end of the segment. This differs from many - (but not all) other pthreads implementations. The intent is - that on machines with a single stack growing toward higher - addresses, stackaddr would be the lowest address in the stack - segment, so that it is consistently close to the initial sp - value. */ -# ifdef __UCLIBC_HAS_TLS__ - new_thread = (pthread_descr) attr->__stackaddr; -# else - new_thread = - (pthread_descr) ((long)(attr->__stackaddr) & -sizeof(void *)) - 1; -# endif + new_thread = (pthread_descr) ((long)(attr->__stackaddr) & -sizeof(void *)) - 1; new_thread_bottom = (char *) attr->__stackaddr - attr->__stacksize; - guardaddr = new_thread_bottom; + guardaddr = NULL; guardsize = 0; -#endif -#ifndef THREAD_SELF __pthread_nonstandard_stacks = 1; +#ifndef __ARCH_USE_MMU__ + /* check the initial thread stack boundaries so they don't overlap */ + NOMMU_INITIAL_THREAD_BOUNDS((char *) new_thread, (char *) new_thread_bottom); + + PDEBUG("initial stack: bos=%p, tos=%p\n", __pthread_initial_thread_bos, + __pthread_initial_thread_tos); #endif -#ifndef __UCLIBC_HAS_TLS__ - /* Clear the thread data structure. */ - memset (new_thread, '\0', sizeof (*new_thread)); -#endif - stacksize = attr->__stacksize; } else { -#ifdef NEED_SEPARATE_REGISTER_STACK - const size_t granularity = 2 * pagesize; - /* Try to make stacksize/2 a multiple of pagesize */ +#ifdef __ARCH_USE_MMU__ + stacksize = STACK_SIZE - pagesize; + if (attr != NULL) + stacksize = MIN(stacksize, roundup(attr->__stacksize, pagesize)); + /* Allocate space for stack and thread descriptor at default address */ + new_thread = default_new_thread; + new_thread_bottom = (char *) (new_thread + 1) - stacksize; + if (mmap((caddr_t)((char *)(new_thread + 1) - INITIAL_STACK_SIZE), + INITIAL_STACK_SIZE, PROT_READ | PROT_WRITE | PROT_EXEC, + MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED | MAP_GROWSDOWN, + -1, 0) == MAP_FAILED) + /* Bad luck, this segment is already mapped. */ + return -1; + /* We manage to get a stack. Now see whether we need a guard + and allocate it if necessary. Notice that the default + attributes (stack_size = STACK_SIZE - pagesize) do not need + a guard page, since the RLIMIT_STACK soft limit prevents stacks + from running into one another. */ + if (stacksize == (size_t) (STACK_SIZE - pagesize)) + { + /* We don't need a guard page. */ + guardaddr = NULL; + guardsize = 0; + } + else + { + /* Put a bad page at the bottom of the stack */ + guardsize = attr->__guardsize; + guardaddr = (void *)new_thread_bottom - guardsize; + if (mmap((caddr_t) guardaddr, guardsize, 0, MAP_FIXED, -1, 0) + == MAP_FAILED) + { + /* We don't make this an error. */ + guardaddr = NULL; + guardsize = 0; + } + } #else - const size_t granularity = pagesize; -#endif - void *map_addr; + /* We cannot mmap to this huge chunk of stack space when we don't have + * an MMU. Pretend we are using a user provided stack even if there was + * none provided by the user. Thus, we get around the mmap and reservation + * of a huge stack segment. -StS */ - /* Allocate space for stack and thread descriptor at default address */ -#if FLOATING_STACKS + stacksize = INITIAL_STACK_SIZE; + /* The user may want to use a non-default stacksize */ if (attr != NULL) { - guardsize = page_roundup (attr->__guardsize, granularity); - stacksize = __pthread_max_stacksize - guardsize; - stacksize = MIN (stacksize, - page_roundup (attr->__stacksize, granularity)); + stacksize = attr->__stacksize; } - else + + /* malloc a stack - memory from the bottom up */ + if ((new_thread_bottom = malloc(stacksize)) == NULL) { - guardsize = granularity; - stacksize = __pthread_max_stacksize - guardsize; + /* bad luck, we cannot malloc any more */ + return -1 ; } + PDEBUG("malloced chunk: base=%p, size=0x%04x\n", new_thread_bottom, stacksize); + + /* Set up the pointers. new_thread marks the TOP of the stack frame and + * the address of the pthread_descr struct at the same time. Therefore we + * must account for its size and fit it in the malloc()'ed block. The + * value of `new_thread' is then passed to clone() as the stack argument. + * + * ^ +------------------------+ + * | | pthread_descr struct | + * | +------------------------+ <- new_thread + * malloc block | | | + * | | thread stack | + * | | | + * v +------------------------+ <- new_thread_bottom + * + * Note: The calculated value of new_thread must be word aligned otherwise + * the kernel chokes on a non-aligned stack frame. Choose the lower + * available word boundary. + */ + new_thread = ((pthread_descr) ((int)(new_thread_bottom + stacksize) & -sizeof(void*))) - 1; + guardaddr = NULL; + guardsize = 0; - map_addr = mmap(NULL, stacksize + guardsize, - PROT_READ | PROT_WRITE | PROT_EXEC, - MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); - if (map_addr == MAP_FAILED) - /* No more memory available. */ - return -1; + PDEBUG("thread stack: bos=%p, tos=%p\n", new_thread_bottom, new_thread); -# ifdef NEED_SEPARATE_REGISTER_STACK - guardaddr = map_addr + stacksize / 2; - if (guardsize > 0) - mprotect (guardaddr, guardsize, PROT_NONE); - - new_thread_bottom = (char *) map_addr; -# ifdef __UCLIBC_HAS_TLS__ - new_thread = ((pthread_descr) (new_thread_bottom + stacksize - + guardsize)); -# else - new_thread = ((pthread_descr) (new_thread_bottom + stacksize - + guardsize)) - 1; -# endif -# elif defined _STACK_GROWS_DOWN - guardaddr = map_addr; - if (guardsize > 0) - mprotect (guardaddr, guardsize, PROT_NONE); - - new_thread_bottom = (char *) map_addr + guardsize; -# ifdef __UCLIBC_HAS_TLS__ - new_thread = ((pthread_descr) (new_thread_bottom + stacksize)); -# else - new_thread = ((pthread_descr) (new_thread_bottom + stacksize)) - 1; -# endif -# elif defined _STACK_GROWS_UP - guardaddr = map_addr + stacksize; - if (guardsize > 0) - mprotect (guardaddr, guardsize, PROT_NONE); - - new_thread = (pthread_descr) map_addr; -# ifdef __UCLIBC_HAS_TLS__ - new_thread_bottom = (char *) new_thread; -# else - new_thread_bottom = (char *) (new_thread + 1); -# endif -# else -# error You must define a stack direction -# endif /* Stack direction */ -#else /* !FLOATING_STACKS */ -# if !defined NEED_SEPARATE_REGISTER_STACK && defined _STACK_GROWS_DOWN - void *res_addr; -# endif + /* check the initial thread stack boundaries so they don't overlap */ + NOMMU_INITIAL_THREAD_BOUNDS((char *) new_thread, (char *) new_thread_bottom); - if (attr != NULL) - { - guardsize = page_roundup (attr->__guardsize, granularity); - stacksize = STACK_SIZE - guardsize; - stacksize = MIN (stacksize, - page_roundup (attr->__stacksize, granularity)); - } - else - { - guardsize = granularity; - stacksize = STACK_SIZE - granularity; - } + PDEBUG("initial stack: bos=%p, tos=%p\n", __pthread_initial_thread_bos, + __pthread_initial_thread_tos); -# ifdef NEED_SEPARATE_REGISTER_STACK - new_thread = default_new_thread; - new_thread_bottom = (char *) (new_thread + 1) - stacksize - guardsize; - /* Includes guard area, unlike the normal case. Use the bottom - end of the segment as backing store for the register stack. - Needed on IA64. In this case, we also map the entire stack at - once. According to David Mosberger, that's cheaper. It also - avoids the risk of intermittent failures due to other mappings - in the same region. The cost is that we might be able to map - slightly fewer stacks. */ - - /* First the main stack: */ - map_addr = (caddr_t)((char *)(new_thread + 1) - stacksize / 2); - res_addr = mmap(map_addr, stacksize / 2, - PROT_READ | PROT_WRITE | PROT_EXEC, - MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); - if (res_addr != map_addr) - { - /* Bad luck, this segment is already mapped. */ - if (res_addr != MAP_FAILED) - munmap(res_addr, stacksize / 2); - return -1; - } - /* Then the register stack: */ - map_addr = (caddr_t)new_thread_bottom; - res_addr = mmap(map_addr, stacksize/2, - PROT_READ | PROT_WRITE | PROT_EXEC, - MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); - if (res_addr != map_addr) - { - if (res_addr != MAP_FAILED) - munmap(res_addr, stacksize / 2); - munmap((caddr_t)((char *)(new_thread + 1) - stacksize/2), - stacksize/2); - return -1; - } - - guardaddr = new_thread_bottom + stacksize/2; - /* We leave the guard area in the middle unmapped. */ -# else /* !NEED_SEPARATE_REGISTER_STACK */ -# ifdef _STACK_GROWS_DOWN - new_thread = default_new_thread; - new_thread_bottom = (char *) (new_thread + 1) - stacksize; - map_addr = new_thread_bottom - guardsize; - res_addr = mmap(map_addr, stacksize + guardsize, - PROT_READ | PROT_WRITE | PROT_EXEC, - MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); - if (res_addr != map_addr) - { - /* Bad luck, this segment is already mapped. */ - if (res_addr != MAP_FAILED) - munmap (res_addr, stacksize + guardsize); - return -1; - } + /* on non-MMU systems we always have non-standard stack frames */ + __pthread_nonstandard_stacks = 1; - /* We manage to get a stack. Protect the guard area pages if - necessary. */ - guardaddr = map_addr; - if (guardsize > 0) - mprotect (guardaddr, guardsize, PROT_NONE); -# else - /* The thread description goes at the bottom of this area, and - * the stack starts directly above it. - */ - new_thread = (pthread_descr)((unsigned long)default_new_thread &~ (STACK_SIZE - 1)); - map_addr = mmap(new_thread, stacksize + guardsize, - PROT_READ | PROT_WRITE | PROT_EXEC, - MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); - if (map_addr == MAP_FAILED) - return -1; - - new_thread_bottom = map_addr + sizeof(*new_thread); - guardaddr = map_addr + stacksize; - if (guardsize > 0) - mprotect (guardaddr, guardsize, PROT_NONE); - -# endif /* stack direction */ -# endif /* !NEED_SEPARATE_REGISTER_STACK */ -#endif /* !FLOATING_STACKS */ +#endif /* __ARCH_USE_MMU__ */ } - *out_new_thread = (char *) new_thread; + + /* Clear the thread data structure. */ + memset (new_thread, '\0', sizeof (*new_thread)); + *out_new_thread = new_thread; *out_new_thread_bottom = new_thread_bottom; *out_guardaddr = guardaddr; *out_guardsize = guardsize; -#ifdef NEED_SEPARATE_REGISTER_STACK - *out_stacksize = stacksize / 2; -#else - *out_stacksize = stacksize; -#endif return 0; } @@ -589,30 +478,17 @@ static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr, size_t sseg; int pid; pthread_descr new_thread; - char *stack_addr; char * new_thread_bottom; + char * new_thread_top; pthread_t new_thread_id; char *guardaddr = NULL; - size_t guardsize = 0, stksize = 0; - int pagesize = __getpagesize(); + size_t guardsize = 0; + int pagesize = getpagesize(); int saved_errno = 0; -#ifdef __UCLIBC_HAS_TLS__ - new_thread = _dl_allocate_tls (NULL); - if (new_thread == NULL) - return EAGAIN; -# if defined(TLS_DTV_AT_TP) - /* pthread_descr is below TP. */ - new_thread = (pthread_descr) ((char *) new_thread - TLS_PRE_TCB_SIZE); -# endif -#else - /* Prevent warnings. */ - new_thread = NULL; -#endif - /* First check whether we have to change the policy and if yes, whether we can do this. Normally this should be done by examining the - return value of the __sched_setscheduler call in pthread_start_thread + return value of the sched_setscheduler call in pthread_start_thread but this is hard to implement. FIXME */ if (attr != NULL && attr->__schedpolicy != SCHED_OTHER && geteuid () != 0) return EPERM; @@ -620,36 +496,21 @@ static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr, for (sseg = 2; ; sseg++) { if (sseg >= PTHREAD_THREADS_MAX) - { -#ifdef __UCLIBC_HAS_TLS__ -# if defined(TLS_DTV_AT_TP) - new_thread = (pthread_descr) ((char *) new_thread + TLS_PRE_TCB_SIZE); -# endif - _dl_deallocate_tls (new_thread, true); -#endif - return EAGAIN; - } + return EAGAIN; if (__pthread_handles[sseg].h_descr != NULL) continue; - if (pthread_allocate_stack(attr, thread_segment(sseg), - pagesize, &stack_addr, &new_thread_bottom, - &guardaddr, &guardsize, &stksize) == 0) - { -#ifdef __UCLIBC_HAS_TLS__ - new_thread->p_stackaddr = stack_addr; -#else - new_thread = (pthread_descr) stack_addr; -#endif - break; + if (pthread_allocate_stack(attr, thread_segment(sseg), pagesize, + &new_thread, &new_thread_bottom, + &guardaddr, &guardsize) == 0) + break; #ifndef __ARCH_USE_MMU__ - } else { - /* When there is MMU, mmap () is used to allocate the stack. If one - * segment is already mapped, we should continue to see if we can - * use the next one. However, when there is no MMU, malloc () is used. - * It's waste of CPU cycles to continue to try if it fails. */ - return EAGAIN; + else + /* When there is MMU, mmap () is used to allocate the stack. If one + * segment is already mapped, we should continue to see if we can + * use the next one. However, when there is no MMU, malloc () is used. + * It's waste of CPU cycles to continue to try if it fails. */ + return EAGAIN; #endif - } } __pthread_handles_num++; /* Allocate new thread identifier */ @@ -657,28 +518,20 @@ static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr, new_thread_id = sseg + pthread_threads_counter; /* Initialize the thread descriptor. Elements which have to be initialized to zero already have this value. */ -#if !defined __UCLIBC_HAS_TLS__ || !TLS_DTV_AT_TP - new_thread->p_header.data.tcb = new_thread; - new_thread->p_header.data.self = new_thread; -#endif -#if TLS_MULTIPLE_THREADS_IN_TCB || !defined __UCLIBC_HAS_TLS__ || !TLS_DTV_AT_TP - new_thread->p_multiple_threads = 1; -#endif new_thread->p_tid = new_thread_id; new_thread->p_lock = &(__pthread_handles[sseg].h_lock); new_thread->p_cancelstate = PTHREAD_CANCEL_ENABLE; new_thread->p_canceltype = PTHREAD_CANCEL_DEFERRED; -#ifndef __UCLIBC_HAS_TLS__ new_thread->p_errnop = &new_thread->p_errno; new_thread->p_h_errnop = &new_thread->p_h_errno; - new_thread->p_resp = &new_thread->p_res; -#endif +#ifdef __UCLIBC_HAS_XLOCALE__ + /* Initialize thread's locale to the global locale. */ + new_thread->locale = __global_locale; +#endif /* __UCLIBC_HAS_XLOCALE__ */ new_thread->p_guardaddr = guardaddr; new_thread->p_guardsize = guardsize; + new_thread->p_self = new_thread; new_thread->p_nr = sseg; - new_thread->p_inheritsched = attr ? attr->__inheritsched : 0; - new_thread->p_alloca_cutoff = stksize / 4 > __MAX_ALLOCA_CUTOFF - ? __MAX_ALLOCA_CUTOFF : stksize / 4; /* Initialize the thread handle */ __pthread_init_lock(&__pthread_handles[sseg].h_lock); __pthread_handles[sseg].h_descr = new_thread; @@ -696,8 +549,8 @@ static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr, sizeof (struct sched_param)); break; case PTHREAD_INHERIT_SCHED: - new_thread->p_start_args.schedpolicy = __sched_getscheduler(father_pid); - __sched_getparam(father_pid, &new_thread->p_start_args.schedparam); + new_thread->p_start_args.schedpolicy = sched_getscheduler(father_pid); + sched_getparam(father_pid, &new_thread->p_start_args.schedparam); break; } new_thread->p_priority = @@ -707,59 +560,55 @@ static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr, new_thread->p_start_args.start_routine = start_routine; new_thread->p_start_args.arg = arg; new_thread->p_start_args.mask = *mask; - /* Make the new thread ID available already now. If any of the later - functions fail we return an error value and the caller must not use - the stored thread ID. */ - *thread = new_thread_id; /* Raise priority of thread manager if needed */ __pthread_manager_adjust_prio(new_thread->p_priority); /* Do the cloning. We have to use two different functions depending on whether we are debugging or not. */ - pid = 0; /* Note that the thread never can have PID zero. */ + pid = 0; /* Note that the thread never can have PID zero. */ + new_thread_top = ((char *)new_thread - THREAD_STACK_OFFSET); + + /* ******************************************************** */ + /* This code was moved from below to cope with running threads + * on uClinux systems. See comment below... + * Insert new thread in doubly linked list of active threads */ + new_thread->p_prevlive = __pthread_main_thread; + new_thread->p_nextlive = __pthread_main_thread->p_nextlive; + __pthread_main_thread->p_nextlive->p_prevlive = new_thread; + __pthread_main_thread->p_nextlive = new_thread; + /* ********************************************************* */ + if (report_events) { /* See whether the TD_CREATE event bit is set in any of the masks. */ int idx = __td_eventword (TD_CREATE); - uint32_t mask = __td_eventmask (TD_CREATE); + uint32_t m = __td_eventmask (TD_CREATE); - if ((mask & (__pthread_threads_events.event_bits[idx] + if ((m & (__pthread_threads_events.event_bits[idx] | event_maskp->event_bits[idx])) != 0) { /* Lock the mutex the child will use now so that it will stop. */ __pthread_lock(new_thread->p_lock, NULL); /* We have to report this event. */ -#ifdef NEED_SEPARATE_REGISTER_STACK - /* Perhaps this version should be used on all platforms. But - this requires that __clone2 be uniformly supported - everywhere. - - And there is some argument for changing the __clone2 - interface to pass sp and bsp instead, making it more IA64 - specific, but allowing stacks to grow outward from each - other, to get less paging and fewer mmaps. */ - pid = __clone2(pthread_start_thread_event, - (void **)new_thread_bottom, - (char *)stack_addr - new_thread_bottom, - CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | CLONE_SYSVSEM | - __pthread_sig_cancel, new_thread); -#elif defined _STACK_GROWS_UP - pid = __clone(pthread_start_thread_event, (void *) new_thread_bottom, - CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | CLONE_SYSVSEM | +#ifdef __ia64__ + pid = __clone2(pthread_start_thread_event, new_thread_top, + new_thread_top - new_thread_bottom, + CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | __pthread_sig_cancel, new_thread); #else - pid = __clone(pthread_start_thread_event, stack_addr, - CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | CLONE_SYSVSEM | + pid = clone(pthread_start_thread_event, new_thread_top, + CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | __pthread_sig_cancel, new_thread); #endif + saved_errno = errno; if (pid != -1) { /* Now fill in the information about the new thread in - the newly created thread's data structure. We cannot let - the new thread do this since we don't know whether it was - already scheduled when we send the event. */ + the newly created thread's data structure. We cannot let + the new thread do this since we don't know whether it was + already scheduled when we send the event. */ new_thread->p_eventbuf.eventdata = new_thread; new_thread->p_eventbuf.eventnum = TD_CREATE; __pthread_last_event = new_thread; @@ -779,69 +628,71 @@ static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr, } if (pid == 0) { -#ifdef NEED_SEPARATE_REGISTER_STACK - pid = __clone2(pthread_start_thread, - (void **)new_thread_bottom, - (char *)stack_addr - new_thread_bottom, - CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | CLONE_SYSVSEM | - __pthread_sig_cancel, new_thread); -#elif defined _STACK_GROWS_UP - pid = __clone(pthread_start_thread, (void *) new_thread_bottom, - CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | CLONE_SYSVSEM | + PDEBUG("cloning new_thread = %p\n", new_thread); +#ifdef __ia64__ + pid = __clone2(pthread_start_thread, new_thread_top, + new_thread_top - new_thread_bottom, + CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | __pthread_sig_cancel, new_thread); #else - pid = __clone(pthread_start_thread, stack_addr, - CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | CLONE_SYSVSEM | + pid = clone(pthread_start_thread, new_thread_top, + CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND | __pthread_sig_cancel, new_thread); -#endif /* !NEED_SEPARATE_REGISTER_STACK */ +#endif saved_errno = errno; } /* Check if cloning succeeded */ if (pid == -1) { + /******************************************************** + * Code inserted to remove the thread from our list of active + * threads in case of failure (needed to cope with uClinux), + * See comment below. */ + new_thread->p_nextlive->p_prevlive = new_thread->p_prevlive; + new_thread->p_prevlive->p_nextlive = new_thread->p_nextlive; + /********************************************************/ + /* Free the stack if we allocated it */ if (attr == NULL || !attr->__stackaddr_set) { -#ifdef NEED_SEPARATE_REGISTER_STACK - size_t stacksize = ((char *)(new_thread->p_guardaddr) - - new_thread_bottom); - munmap((caddr_t)new_thread_bottom, - 2 * stacksize + new_thread->p_guardsize); -#elif defined _STACK_GROWS_UP -# ifdef __UCLIBC_HAS_TLS__ - size_t stacksize = guardaddr - stack_addr; - munmap(stack_addr, stacksize + guardsize); -# else - size_t stacksize = guardaddr - (char *)new_thread; - munmap(new_thread, stacksize + guardsize); -# endif +#ifdef __ARCH_USE_MMU__ + if (new_thread->p_guardsize != 0) + munmap(new_thread->p_guardaddr, new_thread->p_guardsize); + munmap((caddr_t)((char *)(new_thread+1) - INITIAL_STACK_SIZE), + INITIAL_STACK_SIZE); #else -# ifdef __UCLIBC_HAS_TLS__ - size_t stacksize = stack_addr - new_thread_bottom; -# else - size_t stacksize = (char *)(new_thread+1) - new_thread_bottom; -# endif - munmap(new_thread_bottom - guardsize, guardsize + stacksize); -#endif + free(new_thread_bottom); +#endif /* __ARCH_USE_MMU__ */ } -#ifdef __UCLIBC_HAS_TLS__ -# if defined(TLS_DTV_AT_TP) - new_thread = (pthread_descr) ((char *) new_thread + TLS_PRE_TCB_SIZE); -# endif - _dl_deallocate_tls (new_thread, true); -#endif __pthread_handles[sseg].h_descr = NULL; __pthread_handles[sseg].h_bottom = NULL; __pthread_handles_num--; return saved_errno; } + PDEBUG("new thread pid = %d\n", pid); + +#if 0 + /* *********************************************************** + This code has been moved before the call to clone(). In uClinux, + the use of wait on a semaphore is dependant upon that the child so + the child must be in the active threads list. This list is used in + pthread_find_self() to get the pthread_descr of self. So, if the + child calls sem_wait before this code is executed , it will hang + forever and initial_thread will instead be posted by a sem_post + call. */ + /* Insert new thread in doubly linked list of active threads */ new_thread->p_prevlive = __pthread_main_thread; new_thread->p_nextlive = __pthread_main_thread->p_nextlive; __pthread_main_thread->p_nextlive->p_prevlive = new_thread; __pthread_main_thread->p_nextlive = new_thread; + /************************************************************/ +#endif + /* Set pid field of the new thread, in case we get there before the child starts. */ new_thread->p_pid = pid; + /* We're all set */ + *thread = new_thread_id; return 0; } @@ -853,16 +704,21 @@ static void pthread_free(pthread_descr th) { pthread_handle handle; pthread_readlock_info *iter, *next; +#ifndef __ARCH_USE_MMU__ + char *h_bottom_save; +#endif - ASSERT(th->p_exited); /* Make the handle invalid */ handle = thread_handle(th->p_tid); __pthread_lock(&handle->h_lock, NULL); +#ifndef __ARCH_USE_MMU__ + h_bottom_save = handle->h_bottom; +#endif handle->h_descr = NULL; handle->h_bottom = (char *)(-1L); __pthread_unlock(&handle->h_lock); -#ifdef FREE_THREAD - FREE_THREAD(th, th->p_nr); +#ifdef FREE_THREAD_SELF + FREE_THREAD_SELF(th, th->p_nr); #endif /* One fewer threads in __pthread_handles */ __pthread_handles_num--; @@ -884,44 +740,19 @@ static void pthread_free(pthread_descr th) } /* If initial thread, nothing to free */ + if (th == &__pthread_initial_thread) return; if (!th->p_userstack) { - size_t guardsize = th->p_guardsize; +#ifdef __ARCH_USE_MMU__ /* Free the stack and thread descriptor area */ - char *guardaddr = th->p_guardaddr; -#ifdef _STACK_GROWS_UP -# ifdef __UCLIBC_HAS_TLS__ - size_t stacksize = guardaddr - th->p_stackaddr; - guardaddr = th->p_stackaddr; -# else - size_t stacksize = guardaddr - (char *)th; - guardaddr = (char *)th; -# endif + if (th->p_guardsize != 0) + munmap(th->p_guardaddr, th->p_guardsize); + munmap((caddr_t) ((char *)(th+1) - STACK_SIZE), STACK_SIZE); #else - /* Guardaddr is always set, even if guardsize is 0. This allows - us to compute everything else. */ -# ifdef __UCLIBC_HAS_TLS__ - size_t stacksize = th->p_stackaddr - guardaddr - guardsize; -# else - size_t stacksize = (char *)(th+1) - guardaddr - guardsize; -# endif -# ifdef NEED_SEPARATE_REGISTER_STACK - /* Take account of the register stack, which is below guardaddr. */ - guardaddr -= stacksize; - stacksize *= 2; -# endif -#endif - /* Unmap the stack. */ - munmap(guardaddr, stacksize + guardsize); - + /* For non-MMU systems we always malloc the stack, so free it here. -StS */ + free(h_bottom_save); +#endif /* __ARCH_USE_MMU__ */ } - -#ifdef __UCLIBC_HAS_TLS__ -# if defined(TLS_DTV_AT_TP) - th = (pthread_descr) ((char *) th + TLS_PRE_TCB_SIZE); -# endif - _dl_deallocate_tls (th, true); -#endif } /* Handle threads that have exited */ @@ -980,8 +811,9 @@ static void pthread_reap_children(void) { pid_t pid; int status; + PDEBUG("\n"); - while ((pid = waitpid_not_cancel(-1, &status, WNOHANG | __WCLONE)) > 0) { + while ((pid = waitpid(-1, &status, WNOHANG | __WCLONE)) > 0) { pthread_exited(pid); if (WIFSIGNALED(status)) { /* If a thread died due to a signal, send the same signal to @@ -1001,7 +833,7 @@ static void pthread_handle_free(pthread_t th_id) pthread_descr th; __pthread_lock(&handle->h_lock, NULL); - if (nonexisting_handle(handle, th_id)) { + if (invalid_handle(handle, th_id)) { /* pthread_reap_children has deallocated the thread already, nothing needs to be done */ __pthread_unlock(&handle->h_lock); @@ -1035,20 +867,6 @@ static void pthread_kill_all_threads(int sig, int main_thread_also) } } -static void pthread_for_each_thread(void *arg, - void (*fn)(void *, pthread_descr)) -{ - pthread_descr th; - - for (th = __pthread_main_thread->p_nextlive; - th != __pthread_main_thread; - th = th->p_nextlive) { - fn(arg, th); - } - - fn(arg, __pthread_main_thread); -} - /* Process-wide exit() */ static void pthread_handle_exit(pthread_descr issuing_thread, int exitcode) @@ -1056,12 +874,6 @@ static void pthread_handle_exit(pthread_descr issuing_thread, int exitcode) pthread_descr th; __pthread_exit_requested = 1; __pthread_exit_code = exitcode; - /* A forced asynchronous cancellation follows. Make sure we won't - get stuck later in the main thread with a system lock being held - by one of the cancelled threads. Ideally one would use the same - code as in pthread_atfork(), but we can't distinguish system and - user handlers there. */ - __flockfilelist(); /* Send the CANCEL signal to all running threads, including the main thread, but excluding the thread from which the exit request originated (that thread must complete the exit, e.g. calling atexit functions @@ -1078,32 +890,31 @@ static void pthread_handle_exit(pthread_descr issuing_thread, int exitcode) th = th->p_nextlive) { waitpid(th->p_pid, NULL, __WCLONE); } - __fresetlockfiles(); restart(issuing_thread); _exit(0); } /* Handler for __pthread_sig_cancel in thread manager thread */ -void __pthread_manager_sighandler(int sig) +void __pthread_manager_sighandler(int sig attribute_unused) { - int kick_manager = terminated_children == 0 && main_thread_exiting; - terminated_children = 1; - - /* If the main thread is terminating, kick the thread manager loop - each time some threads terminate. This eliminates a two second - shutdown delay caused by the thread manager sleeping in the - call to __poll(). Instead, the thread manager is kicked into - action, reaps the outstanding threads and resumes the main thread - so that it can complete the shutdown. */ - - if (kick_manager) { - struct pthread_request request; - request.req_thread = 0; - request.req_kind = REQ_KICK; - TEMP_FAILURE_RETRY(write_not_cancel(__pthread_manager_request, - (char *) &request, sizeof(request))); - } + int kick_manager = terminated_children == 0 && main_thread_exiting; + terminated_children = 1; + + /* If the main thread is terminating, kick the thread manager loop + each time some threads terminate. This eliminates a two second + shutdown delay caused by the thread manager sleeping in the + call to __poll(). Instead, the thread manager is kicked into + action, reaps the outstanding threads and resumes the main thread + so that it can complete the shutdown. */ + + if (kick_manager) { + struct pthread_request request; + request.req_thread = 0; + request.req_kind = REQ_KICK; + TEMP_FAILURE_RETRY(write(__pthread_manager_request, + (char *) &request, sizeof(request))); + } } /* Adjust priority of thread manager so that it always run at a priority @@ -1113,10 +924,10 @@ void __pthread_manager_adjust_prio(int thread_prio) { struct sched_param param; - if (thread_prio <= manager_thread->p_priority) return; + if (thread_prio <= __pthread_manager_thread.p_priority) return; param.sched_priority = - thread_prio < __sched_get_priority_max(SCHED_FIFO) + thread_prio < sched_get_priority_max(SCHED_FIFO) ? thread_prio + 1 : thread_prio; - __sched_setscheduler(manager_thread->p_pid, SCHED_FIFO, ¶m); - manager_thread->p_priority = thread_prio; + sched_setscheduler(__pthread_manager_thread.p_pid, SCHED_FIFO, ¶m); + __pthread_manager_thread.p_priority = thread_prio; } |