Update.

	* sysdeps/pthread/pthread.h: Add prototypes for pthread_spin_init,
	pthread_spin_destroy, pthread_spin_lock, pthread_spin_trylock,
	and pthread_spin_unlock.
	* sysdeps/pthread/bits/pthreadtypes.h: Change struct _pthread_fastlock
	into pthread_spinlock_t.  Change all uses.
	* spinlock.c: Implement pthread_spin_lock.
	Rename __pthread_unlock to __pthread_spin_unlock and define weak
	alias for real name.
	Define pthread_spin_trylock, pthread_spin_init, and
	pthread_spin_destroy.
	Change all uses of _pthread_fastlock to pthread_spinlock_t.
	* spinlock.h: Rename __pthread_unlock to __pthread_spin_unlock.
	Change all uses of _pthread_fastlock to pthread_spinlock_t.
	* Versions [libpthread] (GLIBC_2.2): Add pthread_spin_init,
	pthread_spin_destroy, pthread_spin_lock, pthread_spin_trylock,
	and pthread_spin_unlock.
	* cancel.c: Use __pthread_spin_unlock instead of __pthread_unlock.
	Change all uses of _pthread_fastlock to pthread_spinlock_t.
	* condvar.c: Likewise.
	* internals.h: Likewise.
	* join.c: Likewise.
	* manager.c: Likewise.
	* mutex.c: Likewise.
	* pthread.c: Likewise.
	* rwlock.c: Likewise.
	* semaphore.c: Likewise.
	* signals.c: Likewise.

2 files changed, 26 insertions, 5 deletions

diff --git a/linuxthreads/sysdeps/pthread/bits/pthreadtypes.h b/linuxthreads/sysdeps/pthread/bits/pthreadtypes.h
index db4c3790ce..a4878310ac 100644
--- a/linuxthreads/sysdeps/pthread/bits/pthreadtypes.h
+++ b/linuxthreads/sysdeps/pthread/bits/pthreadtypes.h
@@ -23,11 +23,11 @@
 #include <bits/sched.h>
 
 /* Fast locks (not abstract because mutexes and conditions aren't abstract). */
-struct _pthread_fastlock
+typedef struct
 {
   long int __status;            /* "Free" or "taken" or head of waiting list */
   int __spinlock;               /* For compare-and-swap emulation */
-};
+} pthread_spinlock_t;
 
 #ifndef _PTHREAD_DESCR_DEFINED
 /* Thread descriptors */
@@ -54,7 +54,7 @@ typedef struct
 /* Conditions (not abstract because of PTHREAD_COND_INITIALIZER */
 typedef struct
 {
-  struct _pthread_fastlock __c_lock; /* Protect against concurrent access */
+  pthread_spinlock_t __c_lock; /* Protect against concurrent access */
   _pthread_descr __c_waiting;        /* Threads waiting on this condition */
 } pthread_cond_t;
 
@@ -78,7 +78,7 @@ typedef struct
   int __m_count;                  /* Depth of recursive locking */
   _pthread_descr __m_owner;       /* Owner thread (if recursive or errcheck) */
   int __m_kind;                   /* Mutex kind: fast, recursive or errcheck */
-  struct _pthread_fastlock __m_lock; /* Underlying fast lock */
+  pthread_spinlock_t __m_lock;    /* Underlying fast lock */
 } pthread_mutex_t;
 
 
@@ -97,7 +97,7 @@ typedef int pthread_once_t;
 /* Read-write locks.  */
 typedef struct _pthread_rwlock_t
 {
-  struct _pthread_fastlock __rw_lock; /* Lock to guarantee mutual exclusion */
+  pthread_spinlock_t __rw_lock;       /* Lock to guarantee mutual exclusion */
   int __rw_readers;                   /* Number of readers */
   _pthread_descr __rw_writer;         /* Identity of writer, or NULL if none */
   _pthread_descr __rw_read_waiting;   /* Threads waiting for reading */
diff --git a/linuxthreads/sysdeps/pthread/pthread.h b/linuxthreads/sysdeps/pthread/pthread.h
index 1ff7cba7a6..4cc1aaae06 100644
--- a/linuxthreads/sysdeps/pthread/pthread.h
+++ b/linuxthreads/sysdeps/pthread/pthread.h
@@ -405,6 +405,27 @@ extern int pthread_rwlockattr_setkind_np (pthread_rwlockattr_t *__attr,
 					  int __pref) __THROW;
 #endif
 
+#ifdef __USE_XOPEN2K
+/* The IEEE Std. 10003.1j-2000 introduces functions to implement
+   spinlocks.  */
+
+/* Initialize the spinlock LOCK.  If PSHARED is nonzero the spinlock can
+   be shared between different processes.  */
+extern int pthread_spin_init (pthread_spinlock_t *__lock, int __pshared);
+
+/* Destroy the spinlock LOCK.  */
+extern int pthread_spin_destroy (pthread_spinlock_t *__lock);
+
+/* Wait until spinlock LOCK is retrieved.  */
+extern int pthread_spin_lock (pthread_spinlock_t *__lock);
+
+/* Try to lock spinlock LOCK.  */
+extern int pthread_spin_trylock (pthread_spinlock_t *__lock);
+
+/* Release spinlock LOCK.  */
+extern int pthread_spin_unlock (pthread_spinlock_t *__lock);
+#endif
+
 
 /* Functions for handling thread-specific data.  */