Finish user stack support. Change locking code to be safe in situations with different priorities.

1998-06-25 19:27  Ulrich Drepper  <drepper@cygnus.com>

	* attr.c: Finish user stack support.  Change locking code to be safe
	in situations with different priorities.
	* cancel.c: Likewise.
	* condvar.c: Likewise.
	* internals.h: Likewise.
	* join.c: Likewise.
	* manager.c: Likewise.
	* mutex.c: Likewise.
	* pthread.c: Likewise.
	* ptlongjmp.c: Likewise.
	* queue.h: Likewise.
	* rwlock.c: Likewise.
	* semaphore.c: Likewise.
	* semaphore.h: Likewise.
	* signals.c: Likewise.
	* spinlock.c: Likewise.
	* spinlock.h: Likewise.
	Patches by Xavier leroy.

1998-06-25  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/pthread/pthread.h: Make [sg]et_stacksize and
	[sg]et_stackaddr prototypes always available.

	* sysdeps/unix/sysv/linux/bits/posix_opt.h: Define
	_POSIX_THREAD_ATTR_STACKSIZE and _POSIX_THREAD_ATTR_STACKADDR.

1 files changed, 42 insertions, 11 deletions

diff --git a/linuxthreads/spinlock.h b/linuxthreads/spinlock.h
index 1707d3e..d21a967 100644
--- a/linuxthreads/spinlock.h
+++ b/linuxthreads/spinlock.h
@@ -1,7 +1,6 @@
 /* Linuxthreads - a simple clone()-based implementation of Posix        */
 /* threads for Linux.                                                   */
-/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) and          */
-/* Richard Henderson (rth@tamu.edu)                                     */
+/* Copyright (C) 1998 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  */
@@ -13,20 +12,52 @@
 /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        */
 /* GNU Library General Public License for more details.                 */
 
-/* Spin locks */
+/* Internal locks */
 
-extern void __pthread_acquire(int * spinlock);
+extern void __pthread_lock(struct _pthread_fastlock * lock);
+extern int __pthread_trylock(struct _pthread_fastlock * lock);
+extern void __pthread_unlock(struct _pthread_fastlock * lock);
 
-static inline void acquire(int * spinlock)
+static inline void __pthread_init_lock(struct _pthread_fastlock * lock)
 {
-  if (testandset(spinlock)) __pthread_acquire(spinlock);
+  lock->status = 0;
+  lock->spinlock = 0;
 }
 
-static inline void release(int * spinlock)
+#define LOCK_INITIALIZER {0, 0}
+
+#if defined(TEST_FOR_COMPARE_AND_SWAP)
+
+extern int __pthread_has_cas;
+extern int __pthread_compare_and_swap(long * ptr, long oldval, long newval,
+                                      int * spinlock);
+
+static inline int compare_and_swap(long * ptr, long oldval, long newval,
+                                   int * spinlock)
+{
+  if (__pthread_has_cas)
+    return __compare_and_swap(ptr, oldval, newval);
+  else
+    return __pthread_compare_and_swap(ptr, oldval, newval, spinlock);
+}
+
+#elif defined(HAS_COMPARE_AND_SWAP)
+
+static inline int compare_and_swap(long * ptr, long oldval, long newval,
+                                   int * spinlock)
 {
-#ifndef RELEASE
-  *spinlock = 0;
+  return __compare_and_swap(ptr, oldval, newval);
+}
+
 #else
-  RELEASE(spinlock);
-#endif
+
+extern int __pthread_compare_and_swap(long * ptr, long oldval, long newval,
+                                      int * spinlock);
+
+static inline int compare_and_swap(long * ptr, long oldval, long newval,
+                                   int * spinlock)
+{
+  return __pthread_compare_and_swap(ptr, oldval, newval, spinlock);
 }
+
+#endif