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-rw-r--r--linuxthreads/cancel.c131
1 files changed, 131 insertions, 0 deletions
diff --git a/linuxthreads/cancel.c b/linuxthreads/cancel.c
new file mode 100644
index 0000000000..a6a0ecaa5a
--- /dev/null
+++ b/linuxthreads/cancel.c
@@ -0,0 +1,131 @@
+/* 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.                 */
+
+/* Thread cancellation */
+
+#include <errno.h>
+#include "pthread.h"
+#include "internals.h"
+#include "spinlock.h"
+#include "restart.h"
+
+int pthread_setcancelstate(int state, int * oldstate)
+{
+  pthread_descr self = thread_self();
+  if (state < PTHREAD_CANCEL_ENABLE || state > PTHREAD_CANCEL_DISABLE)
+    return EINVAL;
+  if (oldstate != NULL) *oldstate = self->p_cancelstate;
+  self->p_cancelstate = state;
+  if (self->p_canceled &&
+      self->p_cancelstate == PTHREAD_CANCEL_ENABLE &&
+      self->p_canceltype == PTHREAD_CANCEL_ASYNCHRONOUS)
+    pthread_exit(PTHREAD_CANCELED);
+  return 0;
+}
+
+int pthread_setcanceltype(int type, int * oldtype)
+{
+  pthread_descr self = thread_self();
+  if (type < PTHREAD_CANCEL_DEFERRED || type > PTHREAD_CANCEL_ASYNCHRONOUS)
+    return EINVAL;
+  if (oldtype != NULL) *oldtype = self->p_canceltype;
+  self->p_canceltype = type;
+  if (self->p_canceled &&
+      self->p_cancelstate == PTHREAD_CANCEL_ENABLE &&
+      self->p_canceltype == PTHREAD_CANCEL_ASYNCHRONOUS)
+    pthread_exit(PTHREAD_CANCELED);
+  return 0;
+}
+
+int pthread_cancel(pthread_t thread)
+{
+  pthread_handle handle = thread_handle(thread);
+  int pid;
+
+  acquire(&handle->h_spinlock);
+  if (invalid_handle(handle, thread)) {
+    release(&handle->h_spinlock);
+    return ESRCH;
+  }
+  handle->h_descr->p_canceled = 1;
+  pid = handle->h_descr->p_pid;
+  release(&handle->h_spinlock);
+  kill(pid, PTHREAD_SIG_CANCEL);
+  return 0;
+}
+
+void pthread_testcancel(void)
+{
+  pthread_descr self = thread_self();
+  if (self->p_canceled && self->p_cancelstate == PTHREAD_CANCEL_ENABLE)
+    pthread_exit(PTHREAD_CANCELED);
+}
+
+void _pthread_cleanup_push(struct _pthread_cleanup_buffer * buffer,
+			   void (*routine)(void *), void * arg)
+{
+  pthread_descr self = thread_self();
+  buffer->routine = routine;
+  buffer->arg = arg;
+  buffer->prev = self->p_cleanup;
+  self->p_cleanup = buffer;
+}
+
+void _pthread_cleanup_pop(struct _pthread_cleanup_buffer * buffer,
+			  int execute)
+{
+  pthread_descr self = thread_self();
+  if (execute) buffer->routine(buffer->arg);
+  self->p_cleanup = buffer->prev;
+}
+
+void _pthread_cleanup_push_defer(struct _pthread_cleanup_buffer * buffer,
+				 void (*routine)(void *), void * arg)
+{
+  pthread_descr self = thread_self();
+  buffer->routine = routine;
+  buffer->arg = arg;
+  buffer->canceltype = self->p_canceltype;
+  buffer->prev = self->p_cleanup;
+  self->p_canceltype = PTHREAD_CANCEL_DEFERRED;
+  self->p_cleanup = buffer;
+}
+
+void _pthread_cleanup_pop_restore(struct _pthread_cleanup_buffer * buffer,
+				  int execute)
+{
+  pthread_descr self = thread_self();
+  if (execute) buffer->routine(buffer->arg);
+  self->p_cleanup = buffer->prev;
+  self->p_canceltype = buffer->canceltype;
+  if (self->p_canceled &&
+      self->p_cancelstate == PTHREAD_CANCEL_ENABLE &&
+      self->p_canceltype == PTHREAD_CANCEL_ASYNCHRONOUS)
+    pthread_exit(PTHREAD_CANCELED);
+}
+
+void __pthread_perform_cleanup(void)
+{
+  pthread_descr self = thread_self();
+  struct _pthread_cleanup_buffer * c;
+  for (c = self->p_cleanup; c != NULL; c = c->prev) c->routine(c->arg);
+}
+
+#ifndef PIC
+/* We need a hook to force the cancelation wrappers to be linked in when
+   static libpthread is used.  */
+extern const int __pthread_provide_wrappers;
+static const int * const __pthread_require_wrappers =
+  &__pthread_provide_wrappers;
+#endif