libpthread/nptl: core of the "Native Posix Threading Library" for uClibc

targetting arm,sh,i386,mips,sparc for now

Signed-off-by: Austin Foxley <austinf@cetoncorp.com>

1 files changed, 271 insertions, 0 deletions

diff --git a/libpthread/nptl/descr.h b/libpthread/nptl/descr.h
new file mode 100644
index 000000000..1a8d91be8
--- /dev/null
+++ b/libpthread/nptl/descr.h
@@ -0,0 +1,271 @@
+/* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef _DESCR_H
+#define _DESCR_H	1
+
+#include <limits.h>
+#include <sched.h>
+#include <setjmp.h>
+#include <stdbool.h>
+#include <sys/types.h>
+#include <hp-timing.h>
+#include <list.h>
+#include <lowlevellock.h>
+#include <pthreaddef.h>
+#include "../nptl_db/thread_db.h"
+#include <tls.h>
+#ifdef HAVE_FORCED_UNWIND
+# include <unwind.h>
+#endif
+#define __need_res_state
+#include <resolv.h>
+
+#ifndef TCB_ALIGNMENT
+# define TCB_ALIGNMENT	sizeof (double)
+#endif
+
+
+/* We keep thread specific data in a special data structure, a two-level
+   array.  The top-level array contains pointers to dynamically allocated
+   arrays of a certain number of data pointers.  So we can implement a
+   sparse array.  Each dynamic second-level array has
+        PTHREAD_KEY_2NDLEVEL_SIZE
+   entries.  This value shouldn't be too large.  */
+#define PTHREAD_KEY_2NDLEVEL_SIZE       32
+
+/* We need to address PTHREAD_KEYS_MAX key with PTHREAD_KEY_2NDLEVEL_SIZE
+   keys in each subarray.  */
+#define PTHREAD_KEY_1STLEVEL_SIZE \
+  ((PTHREAD_KEYS_MAX + PTHREAD_KEY_2NDLEVEL_SIZE - 1) \
+   / PTHREAD_KEY_2NDLEVEL_SIZE)
+
+
+
+
+/* Internal version of the buffer to store cancellation handler
+   information.  */
+struct pthread_unwind_buf
+{
+  struct
+  {
+    __jmp_buf jmp_buf;
+    int mask_was_saved;
+  } cancel_jmp_buf[1];
+
+  union
+  {
+    /* This is the placeholder of the public version.  */
+    void *pad[4];
+
+    struct
+    {
+      /* Pointer to the previous cleanup buffer.  */
+      struct pthread_unwind_buf *prev;
+
+      /* Backward compatibility: state of the old-style cleanup
+	 handler at the time of the previous new-style cleanup handler
+	 installment.  */
+      struct _pthread_cleanup_buffer *cleanup;
+
+      /* Cancellation type before the push call.  */
+      int canceltype;
+    } data;
+  } priv;
+};
+
+
+/* Opcodes and data types for communication with the signal handler to
+   change user/group IDs.  */
+struct xid_command
+{
+  int syscall_no;
+  long int id[3];
+  volatile int cntr;
+};
+
+
+/* Thread descriptor data structure.  */
+struct pthread
+{
+  union
+  {
+#if !defined(TLS_DTV_AT_TP)
+    /* This overlaps the TCB as used for TLS without threads (see tls.h).  */
+    tcbhead_t header;
+#else
+    struct
+    {
+      int multiple_threads;
+    } header;
+#endif
+
+    /* This extra padding has no special purpose, and this structure layout
+       is private and subject to change without affecting the official ABI.
+       We just have it here in case it might be convenient for some
+       implementation-specific instrumentation hack or suchlike.  */
+    void *__padding[16];
+  };
+
+  /* This descriptor's link on the `stack_used' or `__stack_user' list.  */
+  list_t list;
+
+  /* Thread ID - which is also a 'is this thread descriptor (and
+     therefore stack) used' flag.  */
+  pid_t tid;
+
+  /* Process ID - thread group ID in kernel speak.  */
+  pid_t pid;
+
+  /* List of cleanup buffers.  */
+  struct _pthread_cleanup_buffer *cleanup;
+
+  /* Unwind information.  */
+  struct pthread_unwind_buf *cleanup_jmp_buf;
+#define HAVE_CLEANUP_JMP_BUF
+
+  /* Flags determining processing of cancellation.  */
+  int cancelhandling;
+  /* Bit set if cancellation is disabled.  */
+#define CANCELSTATE_BIT		0
+#define CANCELSTATE_BITMASK	0x01
+  /* Bit set if asynchronous cancellation mode is selected.  */
+#define CANCELTYPE_BIT		1
+#define CANCELTYPE_BITMASK	0x02
+  /* Bit set if canceling has been initiated.  */
+#define CANCELING_BIT		2
+#define CANCELING_BITMASK	0x04
+  /* Bit set if canceled.  */
+#define CANCELED_BIT		3
+#define CANCELED_BITMASK	0x08
+  /* Bit set if thread is exiting.  */
+#define EXITING_BIT		4
+#define EXITING_BITMASK		0x10
+  /* Bit set if thread terminated and TCB is freed.  */
+#define TERMINATED_BIT		5
+#define TERMINATED_BITMASK	0x20
+  /* Bit set if thread is supposed to change XID.  */
+#define SETXID_BIT		6
+#define SETXID_BITMASK		0x40
+  /* Mask for the rest.  Helps the compiler to optimize.  */
+#define CANCEL_RESTMASK		0xffffff80
+
+#define CANCEL_ENABLED_AND_CANCELED(value) \
+  (((value) & (CANCELSTATE_BITMASK | CANCELED_BITMASK | EXITING_BITMASK	      \
+	       | CANCEL_RESTMASK | TERMINATED_BITMASK)) == CANCELED_BITMASK)
+#define CANCEL_ENABLED_AND_CANCELED_AND_ASYNCHRONOUS(value) \
+  (((value) & (CANCELSTATE_BITMASK | CANCELTYPE_BITMASK | CANCELED_BITMASK    \
+	       | EXITING_BITMASK | CANCEL_RESTMASK | TERMINATED_BITMASK))     \
+   == (CANCELTYPE_BITMASK | CANCELED_BITMASK))
+
+  /* We allocate one block of references here.  This should be enough
+     to avoid allocating any memory dynamically for most applications.  */
+  struct pthread_key_data
+  {
+    /* Sequence number.  We use uintptr_t to not require padding on
+       32- and 64-bit machines.  On 64-bit machines it helps to avoid
+       wrapping, too.  */
+    uintptr_t seq;
+
+    /* Data pointer.  */
+    void *data;
+  } specific_1stblock[PTHREAD_KEY_2NDLEVEL_SIZE];
+
+  /* Flag which is set when specific data is set.  */
+  bool specific_used;
+
+  /* Two-level array for the thread-specific data.  */
+  struct pthread_key_data *specific[PTHREAD_KEY_1STLEVEL_SIZE];
+
+  /* True if events must be reported.  */
+  bool report_events;
+
+  /* True if the user provided the stack.  */
+  bool user_stack;
+
+  /* True if thread must stop at startup time.  */
+  bool stopped_start;
+
+  /* Lock to synchronize access to the descriptor.  */
+  lll_lock_t lock;
+
+  /* Lock for synchronizing setxid calls.  */
+  lll_lock_t setxid_futex;
+
+#if HP_TIMING_AVAIL
+  /* Offset of the CPU clock at start thread start time.  */
+  hp_timing_t cpuclock_offset;
+#endif
+
+  /* If the thread waits to join another one the ID of the latter is
+     stored here.
+
+     In case a thread is detached this field contains a pointer of the
+     TCB if the thread itself.  This is something which cannot happen
+     in normal operation.  */
+  struct pthread *joinid;
+  /* Check whether a thread is detached.  */
+#define IS_DETACHED(pd) ((pd)->joinid == (pd))
+
+  /* Flags.  Including those copied from the thread attribute.  */
+  int flags;
+
+  /* The result of the thread function.  */
+  void *result;
+
+  /* Scheduling parameters for the new thread.  */
+  struct sched_param schedparam;
+  int schedpolicy;
+
+  /* Start position of the code to be executed and the argument passed
+     to the function.  */
+  void *(*start_routine) (void *);
+  void *arg;
+
+  /* Debug state.  */
+  td_eventbuf_t eventbuf;
+  /* Next descriptor with a pending event.  */
+  struct pthread *nextevent;
+
+#ifdef HAVE_FORCED_UNWIND
+  /* Machine-specific unwind info.  */
+  struct _Unwind_Exception exc;
+#endif
+
+  /* If nonzero pointer to area allocated for the stack and its
+     size.  */
+  void *stackblock;
+  size_t stackblock_size;
+  /* Size of the included guard area.  */
+  size_t guardsize;
+  /* This is what the user specified and what we will report.  */
+  size_t reported_guardsize;
+
+  /* Resolver state.  */
+  struct __res_state res;
+
+  /* This member must be last.  */
+  char end_padding[];
+
+#define PTHREAD_STRUCT_END_PADDING \
+  (sizeof (struct pthread) - offsetof (struct pthread, end_padding))
+} __attribute ((aligned (TCB_ALIGNMENT)));
+
+
+#endif	/* descr.h */