LinuxThreads library.

1998-03-11 00:42  Wolfram Gloger  <wmglo@dent.med.uni-muenchen.de>
	* linuxthreads/manager.c: Enable resetting of the thread
	scheduling policy to SCHED_OTHER when the parent thread
	has a different one.
1998-02-01 13:51  Ulrich Drepper  <drepper@cygnus.com>
	* sysdeps/unix/sysv/linux/bits/posix_opt.h: Define
	_POSIX_ASYNCHRONOUS_IO.
	* sysdeps/pthread/pthread.h: Define bits for Unix98 variants of
	mutexes.
	* mutex.c: Implement new mutex types.
	* internals.h: Include <signal.h>.
	* libpthread.map: Add __erno_location and __h_errno_location.
	* errno.c: Return pointer to variable actually in use.  This might
	not be the one in the thread structure.
	* internals.h (struct _pthread_descr_struct): Add new fields p_errnop
	and p_h_errnop.
	* manager.c (__pthread_manager): Set p_errnop and p_h_errnop member
	of manager thread structure.
	(pthread_handle_create): Set p_errnop and p_h_errnop members for new
	thread.
	* pthread.c: Adapt initializer for thread structures.
	(__pthread_initial_thread): Set p_errnop and p_h_errnop member.
	(__pthread_reset_main_thread): Reset p_errnop and p_h_errnop of
	current thread to global variables.
1998-01-31 17:27  Ulrich Drepper  <drepper@cygnus.com>
	* rwlock.c: New file.
	* Makefile (libpthread-routines): Add rwlock.
	* sysdeps/pthread/pthread.h: Define data structures and declare
	functions.
	* libpthread.map: Add new functions.
1997-12-18 13:50  Philip Blundell  <pb@nexus.co.uk>
	* sysdeps/arm/pt-machine.h: New file; add ARM support.
	* sysdeps/arm/Implies: likewise.
	* README: Document it.
1997-12-13  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>
	* signals.c: Remove unneeded initializer for sigwaited, saving a
1997-04-11 01:18  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>
	* semaphore.c (sem_init): Set sem_spinlock only if available.
1997-12-04 01:48  Ulrich Drepper  <drepper@cygnus.com>
	* mutex.c: Implement PTHREAD_MUTEX_CHECKERROR.
	* sysdeps/pthread/pthread.h: Define PTHREAD_MUTEX_CHECKERROR.
	* Makefile: Update from LinuxThreads 0.7.
	* internals.h. Likewise.
	* manager.c: Likewise.
	* mutex.c: Likewise.
	* pthread.c: Likewise.
	* signals.c: Likewise.
	* specific.c: Likewise.
	* Examples/ex3.c: Likewise.
1997-11-20 18:13  Ulrich Drepper  <drepper@cygnus.com>
	* pthread.c (__pthread_reset_main_thread): Close pipe only if still
	open.
1997-10-29 05:38  Ulrich Drepper  <drepper@cygnus.com>

	* wrapsyscall.c: Add socket functions which are also cancelation
	points.

1997-10-19 21:40  Wolfram Gloger  <wg@wolfram.dent.med.uni-muenchen.de>

	* specific.c (__libc_internal_tsd_set, __libc_internal_tsd_get):
	New functions for fast thread specific data within libc.

	* internals.h: Add new array p_libc_specific to struct
	_pthread_descr_struct.

	* sysdeps/pthread/bits/libc-lock.h: Declare new functions.

1997-10-13 05:39  Ulrich Drepper  <drepper@cygnus.com>

	* semaphore.h: Add __BEGIN_DECLS/__END_DECLS.
	Reported by Ralf Corsepius <corsepiu@faw.uni-ulm.de>.

1997-08-29 03:05  Ulrich Drepper  <drepper@cygnus.com>

	* internals.h (struct _pthread_descr_struct): Add definitions for
	two-level specific key handling.
	* manager.c (pthread_handle_create): Initialize specific memory array.
	* specific.c: Implement two-level key handling.
	* weaks.c: Don't provide dummy key handling.
	* sysdeps/pthread/bits/libc-lock.h: Typedef __libc_lock_t (no #define).
	Add definition of __libc_key_t.
	* sysdeps/unix/sysv/linux/bits/local_lim.h: Define PTHREAD_KEYS_MAX
	as 1024.
	Add definition of _POSIX_THREAD_DESTRUCTOR_ITERATIONS and
	PTHREAD_DESTRUCTOR_ITERATIONS.

	* manager.c (pthread_handle_create): Compare mmap result with
	MAP_FAILED.

	* ptfork.c: Rename to __pthread_atfork and make old name a weak alias.
	* sysdeps/pthread/bits/pthread.h: Add prototype for __pthread_atfork.

1997-08-22 19:04  Richard Henderson  <rth@cygnus.com>

	sysdeps/sparc -> sysdeps/sparc/sparc32
	sysdeps/sparc64 -> sysdeps/sparc/sparc64

	* internals.h: Change definition of THREAD_SELF to be an expression,
	not a statement that did a return.
	* sysdeps/alpha/pt-machine.h (THREAD_SELF): Update accordingly.
	* sysdeps/sparc/sparc32/pt-machine.h (THREAD_SELF, INIT_THREAD_SELF):
	Follow Solaris and use a "system reserved" register (%g6) to hold
	the thread descriptor.
	* sysdeps/sparc/sparc64/pt-machine.h: Likewise.

1997-08-03 00:09  Ulrich Drepper  <drepper@cygnus.com>

	* mutex.c: Correct pthread_once.  Patch by Xavier Leroy.
	* sysdeps/pthread/pthread.h: Add prototype for __pthread_once.
	* sysdeps/pthread/bits/pthread.h: Add macros for __libc_once.

	* semaphore.c: Include spinlock.h only when needed.

	* specific.c (__pthread_setsepcific, __pthread_getspecific): Reject
	keys for entries not in use.

	* weaks.c: Implement key handling functions for real.

1997-06-29  01:04  Richard Henderson  <richard@gnu.ai.mit.edu>

	Initial sparc64-linux support:
	* linuxthreads/sysdeps/sparc64/Implies: New file.
	* linuxthreads/sysdeps/sparc64/pt-machine.h: Likewise.

1997-06-29 00:48  Ulrich Drepper  <drepper@cygnus.com>

	* semaphore.c: Include spinlock.h at correct place.
	Patch by HJ Lu.

1997-06-13 10:06  Richard Henderson  <rth@tamu.edu>

	The Great Bit File Move:
	* sysdeps/alpha/semaphorebits.h: -> .../bits/semaphore.h.
	* sysdeps/powerpc/semaphorebits.h: Likewise.
	* sysdeps/pthread/cmpxchg/semaphorebits.h: Likewise.
	* sysdeps/pthread/no-cmpxchg/semaphorebits.h: Likewise.
	* sysdeps/pthread/libc-lock.h: -> bits/
	* sysdeps/pthread/stdio-lock.h: Likewise.
	* sysdeps/unix/sysv/linux/local_lim.h: Likewise.
	* sysdeps/unix/sysv/linux/posix_opt.h: Likewise.
	* semaphore.h: Likewise.
	* sysdeps/pthread/pthread.h: Likewise.

	* lockfile.c: <foo.h> -> <bits/foo.h>.
	* semaphore.h: Likewise.

	* Makefile: (headers): foo.h -> bits/foo.h.
	* sysdeps/pthread/Makefile: Likewise.

1997-04-11 01:18  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* semaphore.c (sem_init): Set sem_spinlock only if available.

	* sysdeps/m68k/pt-machine.h (testandset, __compare_and_swap): Fix
	asm constraints.

1997-04-09 03:00  Ulrich Drepper  <drepper@cygnus.com>

	Update from LinuxThreads 0.6.

	* attr.c (pthread_attr_getdetachstate): Use __sched_get_priority_max
	and __sched_get_priority_min instead of names without `__'.

	* manager.c: Rewrite large parts to implement opaque pthread_t.

	* cancel.c: Adapt for opaque pthread_t type.
	* condvar.c: Likewise.
	* errno.c: Likewise.
	* join.c: Likewise.
	* mutex.c: Likewise.
	* pthread.c: Likewise.
	* signals.c: Likewise.
	* specific.c: Likewise.
	* restart.h: Likewise.
	* queue.h: Likewise.
	* Examples/ex3.c: Likewise.
	* Examples/ex4.c: Likewise.
	* sysdeps/pthread/pthread.h: Likewise.

	* pthread.c: Accumulate time for all threads in thread manager.

	* semaphore.c: Implement fallback implementation for architectures
	sometimes missing compare-exchange operations.

	* cancel.c (pthread_cancel): Validate handle argument.
	* join.c (pthread_join): Likewise.
	(pthread_detach): Likewise.
	* signals.c (pthread_kill): Likewise.

	* spinlock.h (acquire): Use __sched_yield not sched_yield.

	* queue.h (enqueue): Enqueue thread according to priority.

	* internals.c (struct pthread_start_args): New struct for passing
	args to cloning function.
	(struct _pthread): Rename to _pthread_descr_struct and adapt for
	opaque pthread_t.

	* Examples/Makefile (clean): Pass -f option to rm.

	* sysdeps/i386/pt-machine.h: Add check for compare-exchange instruction
	and define TEST_FOR_COMPARE_AND_SWAP.
	* sysdeps/i386/i486/pt-machine.h: Removed.

	* sysdeps/unix/sysv/linux/local_lim.h (PTHREAD_THREADS_MAX): Increase
	to 1024.

1997-04-04 16:38  Ulrich Drepper  <drepper@cygnus.com>

	* restart.h (suspend): Clear p_signal before suspending.
	(suspend_with_cancellation): Likewise.
	Patch by Xavier Leroy <Xavier.Leroy@inria.fr>.

	* weaks.c: Make __pthread_key_create return 1.
	* sysdeps/pthread/libc-lock.h: Define __libc_key_create,
	__libc_getspecific, __libc_setspecific, and __libc_key_t.
	* sysdeps/pthread/stdio-lock.h: Don't care for implementation not
	using libio.

1997-03-19 15:13  Miguel de Icaza  <miguel@nuclecu.unam.mx>

	* sysdeps/sparc/pt-machine (RELEASE): Fix.

1997-03-01 07:55  Geoff Keating  <geoffk@ozemail.com.au>

	* sysdeps/powerpc/Implies: Added.
	* sysdeps/powerpc/pt-machine.h: Added.
	* sysdeps/powerpc/semaphorebits.h: Added.

1997-01-22 01:22  Ulrich Drepper  <drepper@cygnus.com>

	* linuxtheads/pthread.c (__pthread_initial_thread): Correct
	initializer.
	(__pthread_manager_thread): Likewise.
	Reported by Andreas Jaeger.

1997-01-18 22:15  Richard Henderson  <rth@tamu.edu>

	Since sigset_t no longer fits in a register, we can't pass in the
	thread's initial mask so easily.  Take this opportunity to simplify
	the clone implementation by only accepting a single void* argument.

	* linuxthreads/manager.c (__pthread_manager): Put thread vitals
	in the thread struct instead of as arguments through clone.
	(pthread_start_thread): Look for them there.
	* linuxthreads/internals.h (struct _pthread): Add p_initial_fn,
	p_initial_fn_arg, p_initial_mask.  Fix __pthread_manager proto.
	* linuxthreads/pthread.c (pthread_initialize_manager): Revise
	clone invocation.

1 files changed, 400 insertions, 0 deletions

diff --git a/linuxthreads/manager.c b/linuxthreads/manager.c
new file mode 100644
index 0000000000..325955db4a
--- /dev/null
+++ b/linuxthreads/manager.c
@@ -0,0 +1,400 @@
+/* Linuxthreads - a simple clone()-based implementation of Posix        */
+/* threads for Linux.                                                   */
+/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr)              */
+/*                                                                      */
+/* This program is free software; you can redistribute it and/or        */
+/* modify it under the terms of the GNU Library General Public License  */
+/* as published by the Free Software Foundation; either version 2       */
+/* of the License, or (at your option) any later version.               */
+/*                                                                      */
+/* This program 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 Library General Public License for more details.                 */
+
+/* The "thread manager" thread: manages creation and termination of threads */
+
+#include <errno.h>
+#include <sched.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/select.h>		/* for select */
+#include <sys/mman.h>           /* for mmap */
+#include <sys/time.h>
+#include <sys/wait.h>           /* for waitpid macros */
+#include <linux/tasks.h>
+
+#include "pthread.h"
+#include "internals.h"
+#include "spinlock.h"
+#include "restart.h"
+
+/* Array of active threads. Entry 0 is reserved for the initial thread. */
+
+struct pthread_handle_struct __pthread_handles[PTHREAD_THREADS_MAX] =
+{ { 0, &__pthread_initial_thread}, /* All NULLs */ };
+
+/* 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. */
+
+static inline pthread_descr thread_segment(int seg)
+{
+  return (pthread_descr)(THREAD_STACK_START_ADDRESS - (seg - 1) * STACK_SIZE)
+         - 1;
+}
+
+/* Flag set in signal handler to record child termination */
+
+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 = 0;
+
+/* Counter used to generate unique thread identifier.
+   Thread identifier is pthread_threads_counter + segment. */
+
+static pthread_t pthread_threads_counter = 0;
+
+/* Forward declarations */
+
+static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr,
+                                 void * (*start_routine)(void *), void *arg,
+                                 sigset_t *mask, int father_pid);
+static void pthread_handle_free(pthread_descr th);
+static void pthread_handle_exit(pthread_descr issuing_thread, int exitcode);
+static void pthread_reap_children(void);
+static void pthread_kill_all_threads(int sig, int main_thread_also);
+
+/* The server thread managing requests for thread creation and termination */
+
+int __pthread_manager(void *arg)
+{
+  int reqfd = (int)arg;
+  sigset_t mask;
+  fd_set readfds;
+  struct timeval timeout;
+  int n;
+  struct pthread_request request;
+
+  /* If we have special thread_self processing, initialize it.  */
+#ifdef INIT_THREAD_SELF
+  INIT_THREAD_SELF(&__pthread_manager_thread);
+#endif
+  /* Set the error variable.  */
+  __pthread_manager_thread.p_errnop = &__pthread_manager_thread.p_errno;
+  __pthread_manager_thread.p_h_errnop = &__pthread_manager_thread.p_h_errno;
+  /* Block all signals except PTHREAD_SIG_RESTART */
+  sigfillset(&mask);
+  sigdelset(&mask, PTHREAD_SIG_RESTART);
+  sigprocmask(SIG_SETMASK, &mask, NULL);
+  /* Enter server loop */
+  while(1) {
+    FD_ZERO(&readfds);
+    FD_SET(reqfd, &readfds);
+    timeout.tv_sec = 2;
+    timeout.tv_usec = 0;
+    n = __select(FD_SETSIZE, &readfds, NULL, NULL, &timeout);
+    /* Check for termination of the main thread */
+    if (getppid() == 1) {
+      pthread_kill_all_threads(SIGKILL, 0);
+      _exit(0);
+    }
+    /* Check for dead children */
+    if (terminated_children) {
+      terminated_children = 0;
+      pthread_reap_children();
+    }
+    /* Read and execute request */
+    if (n == 1 && FD_ISSET(reqfd, &readfds)) {
+      n = __libc_read(reqfd, (char *)&request, sizeof(request));
+      ASSERT(n == sizeof(request));
+      switch(request.req_kind) {
+      case REQ_CREATE:
+        request.req_thread->p_retcode =
+          pthread_handle_create((pthread_t *) &request.req_thread->p_retval,
+                                request.req_args.create.attr,
+                                request.req_args.create.fn,
+                                request.req_args.create.arg,
+                                &request.req_args.create.mask,
+                                request.req_thread->p_pid);
+        restart(request.req_thread);
+        break;
+      case REQ_FREE:
+        pthread_handle_free(request.req_args.free.thread);
+        break;
+      case REQ_PROCESS_EXIT:
+        pthread_handle_exit(request.req_thread,
+                            request.req_args.exit.code);
+        break;
+      case REQ_MAIN_THREAD_EXIT:
+        main_thread_exiting = 1;
+        if (__pthread_main_thread->p_nextlive == __pthread_main_thread) {
+          restart(__pthread_main_thread);
+          return 0;
+        }
+        break;
+      }
+    }
+  }
+}
+
+/* Process creation */
+
+static int pthread_start_thread(void *arg)
+{
+  pthread_descr self = (pthread_descr) arg;
+  void * outcome;
+  /* Initialize special thread_self processing, if any.  */
+#ifdef INIT_THREAD_SELF
+  INIT_THREAD_SELF(self);
+#endif
+  /* Make sure our pid field is initialized, just in case we get there
+     before our father has initialized it. */
+  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 (self->p_start_args.schedpolicy >= 0)
+    __sched_setscheduler(self->p_pid, self->p_start_args.schedpolicy,
+                         &self->p_start_args.schedparam);
+  /* Run the thread code */
+  outcome = self->p_start_args.start_routine(self->p_start_args.arg);
+  /* Exit with the given return value */
+  pthread_exit(outcome);
+  return 0;
+}
+
+static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr,
+                                 void * (*start_routine)(void *), void *arg,
+                                 sigset_t * mask, int father_pid)
+{
+  size_t sseg;
+  int pid;
+  pthread_descr new_thread;
+  pthread_t new_thread_id;
+  int i;
+
+  /* Find a free stack segment for the current stack */
+  for (sseg = 1; ; sseg++) {
+    if (sseg >= PTHREAD_THREADS_MAX) return EAGAIN;
+    if (__pthread_handles[sseg].h_descr != NULL) continue;
+    new_thread = thread_segment(sseg);
+    /* Allocate space for stack and thread descriptor. */
+    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) break;
+    /* It seems part of this segment is already mapped. Try the next. */
+  }
+  /* Allocate new thread identifier */
+  pthread_threads_counter += PTHREAD_THREADS_MAX;
+  new_thread_id = sseg + pthread_threads_counter;
+  /* Initialize the thread descriptor */
+  new_thread->p_nextwaiting = NULL;
+  new_thread->p_tid = new_thread_id;
+  new_thread->p_priority = 0;
+  new_thread->p_spinlock = &(__pthread_handles[sseg].h_spinlock);
+  new_thread->p_signal = 0;
+  new_thread->p_signal_jmp = NULL;
+  new_thread->p_cancel_jmp = NULL;
+  new_thread->p_terminated = 0;
+  new_thread->p_detached = attr == NULL ? 0 : attr->detachstate;
+  new_thread->p_exited = 0;
+  new_thread->p_retval = NULL;
+  new_thread->p_joining = NULL;
+  new_thread->p_cleanup = NULL;
+  new_thread->p_cancelstate = PTHREAD_CANCEL_ENABLE;
+  new_thread->p_canceltype = PTHREAD_CANCEL_DEFERRED;
+  new_thread->p_canceled = 0;
+  new_thread->p_errnop = &new_thread->p_errno;
+  new_thread->p_errno = 0;
+  new_thread->p_h_errnop = &new_thread->p_h_errno;
+  new_thread->p_h_errno = 0;
+  for (i = 0; i < PTHREAD_KEY_1STLEVEL_SIZE; i++)
+    new_thread->p_specific[i] = NULL;
+  /* Initialize the thread handle */
+  __pthread_handles[sseg].h_spinlock = 0; /* should already be 0 */
+  __pthread_handles[sseg].h_descr = new_thread;
+  /* Determine scheduling parameters for the thread */
+  new_thread->p_start_args.schedpolicy = -1;
+  if (attr != NULL) {
+    switch(attr->inheritsched) {
+    case PTHREAD_EXPLICIT_SCHED:
+      new_thread->p_start_args.schedpolicy = attr->schedpolicy;
+      new_thread->p_start_args.schedparam = attr->schedparam;
+      break;
+    case PTHREAD_INHERIT_SCHED:
+      /* schedpolicy doesn't need to be set, only get priority */
+      __sched_getparam(father_pid, &new_thread->p_start_args.schedparam);
+      break;
+    }
+    new_thread->p_priority =
+      new_thread->p_start_args.schedparam.sched_priority;
+  }
+  /* Finish setting up arguments to pthread_start_thread */
+  new_thread->p_start_args.start_routine = start_routine;
+  new_thread->p_start_args.arg = arg;
+  new_thread->p_start_args.mask = *mask;
+  /* Do the cloning */
+  pid = __clone(pthread_start_thread, (void **) new_thread,
+                CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND |
+                PTHREAD_SIG_RESTART,
+                new_thread);
+  /* Check if cloning succeeded */
+  if (pid == -1) {
+    /* Free the stack */
+    munmap((caddr_t)((char *)(new_thread+1) - INITIAL_STACK_SIZE),
+           INITIAL_STACK_SIZE);
+    __pthread_handles[sseg].h_descr = NULL;
+    return errno;
+  }
+  /* 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;
+  /* 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;
+}
+
+/* Free the resources of a thread. */
+
+static void pthread_free(pthread_descr th)
+{
+  pthread_handle handle;
+  ASSERT(th->p_exited);
+  /* Make the handle invalid */
+  handle =  thread_handle(th->p_tid);
+  acquire(&handle->h_spinlock);
+  handle->h_descr = NULL;
+  release(&handle->h_spinlock);
+  /* If initial thread, nothing to free */
+  if (th == &__pthread_initial_thread) return;
+  /* Free the stack and thread descriptor area */
+  munmap((caddr_t) ((char *)(th+1) - STACK_SIZE), STACK_SIZE);
+}
+
+/* Handle threads that have exited */
+
+static void pthread_exited(pid_t pid)
+{
+  pthread_descr th;
+  int detached;
+  /* Find thread with that pid */
+  for (th = __pthread_main_thread->p_nextlive;
+       th != __pthread_main_thread;
+       th = th->p_nextlive) {
+    if (th->p_pid == pid) {
+      /* Remove thread from list of active threads */
+      th->p_nextlive->p_prevlive = th->p_prevlive;
+      th->p_prevlive->p_nextlive = th->p_nextlive;
+      /* Mark thread as exited, and if detached, free its resources */
+      acquire(th->p_spinlock);
+      th->p_exited = 1;
+      detached = th->p_detached;
+      release(th->p_spinlock);
+      if (detached) pthread_free(th);
+      break;
+    }
+  }
+  /* If all threads have exited and the main thread is pending on a
+     pthread_exit, wake up the main thread and terminate ourselves. */
+  if (main_thread_exiting &&
+      __pthread_main_thread->p_nextlive == __pthread_main_thread) {
+    restart(__pthread_main_thread);
+    _exit(0);
+  }
+}
+
+static void pthread_reap_children(void)
+{
+  pid_t pid;
+  int status;
+
+  while ((pid = __libc_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
+         all other threads, including the main thread. */
+      pthread_kill_all_threads(WTERMSIG(status), 1);
+      _exit(0);
+    }
+  }
+}
+
+/* Free the resources of a thread */
+
+static void pthread_handle_free(pthread_descr th)
+{
+  acquire(th->p_spinlock);
+  if (th->p_exited) {
+    release(th->p_spinlock);
+    pthread_free(th);
+  } else {
+    /* The Unix process of the thread is still running.
+       Mark the thread as detached so that the thread manager will
+       deallocate its resources when the Unix process exits. */
+    th->p_detached = 1;
+    release(th->p_spinlock);
+  }
+}
+
+/* Send a signal to all running threads */
+
+static void pthread_kill_all_threads(int sig, int main_thread_also)
+{
+  pthread_descr th;
+  for (th = __pthread_main_thread->p_nextlive;
+       th != __pthread_main_thread;
+       th = th->p_nextlive) {
+    kill(th->p_pid, sig);
+  }
+  if (main_thread_also) {
+    kill(__pthread_main_thread->p_pid, sig);
+  }
+}
+
+/* Process-wide exit() */
+
+static void pthread_handle_exit(pthread_descr issuing_thread, int exitcode)
+{
+  pthread_descr th;
+  __pthread_exit_requested = 1;
+  __pthread_exit_code = exitcode;
+  /* 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
+     and flushing stdio buffers). */
+  for (th = issuing_thread->p_nextlive;
+       th != issuing_thread;
+       th = th->p_nextlive) {
+    kill(th->p_pid, PTHREAD_SIG_CANCEL);
+  }
+  /* Now, wait for all these threads, so that they don't become zombies
+     and their times are properly added to the thread manager's times. */
+  for (th = issuing_thread->p_nextlive;
+       th != issuing_thread;
+       th = th->p_nextlive) {
+    waitpid(th->p_pid, NULL, __WCLONE);
+  }
+  restart(issuing_thread);
+  _exit(0);
+}
+
+/* Handler for PTHREAD_SIG_RESTART in thread manager thread */
+
+void __pthread_manager_sighandler(int sig)
+{
+  terminated_children = 1;
+}