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 __ia |