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

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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.
This commit is contained in:
Ulrich Drepper
1998-06-25 19:36:00 +00:00
parent d47aac3999
commit 3387a425e6
23 changed files with 633 additions and 512 deletions
Download Patch File Download Diff File Expand all files Collapse all files

47
linuxthreads/rwlock.c
View File

@@ -30,12 +30,11 @@ int
pthread_rwlock_init (pthread_rwlock_t *rwlock,
const pthread_rwlockattr_t *attr)
{
rwlock->rw_spinlock = 0;
__pthread_init_lock(&rwlock->rw_lock);
rwlock->rw_readers = 0;
rwlock->rw_writer = NULL;
queue_init(&rwlock->rw_read_waiting);
queue_init(&rwlock->rw_write_waiting);
rwlock->rw_read_waiting = NULL;
rwlock->rw_write_waiting = NULL;
if (attr == NULL)
{
@@ -58,10 +57,10 @@ pthread_rwlock_destroy (pthread_rwlock_t *rwlock)
int readers;
_pthread_descr writer;
acquire (&rwlock->rw_spinlock);
__pthread_lock (&rwlock->rw_lock);
readers = rwlock->rw_readers;
writer = rwlock->rw_writer;
release (&rwlock->rw_spinlock);
__pthread_unlock (&rwlock->rw_lock);
if (readers > 0 || writer != NULL)
return EBUSY;
@@ -77,7 +76,7 @@ pthread_rwlock_rdlock (pthread_rwlock_t *rwlock)
while (1)
{
acquire (&rwlock->rw_spinlock);
__pthread_lock (&rwlock->rw_lock);
if (rwlock->rw_writer == NULL
|| (rwlock->rw_kind == PTHREAD_RWLOCK_PREFER_READER_NP
&& rwlock->rw_readers != 0))
@@ -87,12 +86,12 @@ pthread_rwlock_rdlock (pthread_rwlock_t *rwlock)
/* Suspend ourselves, then try again */
self = thread_self ();
enqueue (&rwlock->rw_read_waiting, self);
release (&rwlock->rw_spinlock);
__pthread_unlock (&rwlock->rw_lock);
suspend (self); /* This is not a cancellation point */
}
++rwlock->rw_readers;
release (&rwlock->rw_spinlock);
__pthread_unlock (&rwlock->rw_lock);
return 0;
}
@@ -103,7 +102,7 @@ pthread_rwlock_tryrdlock (pthread_rwlock_t *rwlock)
{
int result = EBUSY;
acquire (&rwlock->rw_spinlock);
__pthread_lock (&rwlock->rw_lock);
if (rwlock->rw_writer == NULL
|| (rwlock->rw_kind == PTHREAD_RWLOCK_PREFER_READER_NP
&& rwlock->rw_readers != 0))
@@ -111,7 +110,7 @@ pthread_rwlock_tryrdlock (pthread_rwlock_t *rwlock)
++rwlock->rw_readers;
result = 0;
}
release (&rwlock->rw_spinlock);
__pthread_unlock (&rwlock->rw_lock);
return result;
}
@@ -124,17 +123,17 @@ pthread_rwlock_wrlock (pthread_rwlock_t *rwlock)
while(1)
{
acquire (&rwlock->rw_spinlock);
__pthread_lock (&rwlock->rw_lock);
if (rwlock->rw_readers == 0 && rwlock->rw_writer == NULL)
{
rwlock->rw_writer = self;
release (&rwlock->rw_spinlock);
__pthread_unlock (&rwlock->rw_lock);
return 0;
}
/* Suspend ourselves, then try again */
enqueue (&rwlock->rw_write_waiting, self);
release (&rwlock->rw_spinlock);
__pthread_unlock (&rwlock->rw_lock);
suspend (self); /* This is not a cancellation point */
}
}
@@ -145,13 +144,13 @@ pthread_rwlock_trywrlock (pthread_rwlock_t *rwlock)
{
int result = EBUSY;
acquire (&rwlock->rw_spinlock);
__pthread_lock (&rwlock->rw_lock);
if (rwlock->rw_readers == 0 && rwlock->rw_writer == NULL)
{
rwlock->rw_writer = thread_self ();
result = 0;
}
release (&rwlock->rw_spinlock);
__pthread_unlock (&rwlock->rw_lock);
return result;
}
@@ -160,16 +159,16 @@ pthread_rwlock_trywrlock (pthread_rwlock_t *rwlock)
int
pthread_rwlock_unlock (pthread_rwlock_t *rwlock)
{
struct _pthread_queue torestart;
pthread_descr torestart;
pthread_descr th;
acquire (&rwlock->rw_spinlock);
__pthread_lock (&rwlock->rw_lock);
if (rwlock->rw_writer != NULL)
{
/* Unlocking a write lock. */
if (rwlock->rw_writer != thread_self ())
{
release (&rwlock->rw_spinlock);
__pthread_unlock (&rwlock->rw_lock);
return EPERM;
}
rwlock->rw_writer = NULL;
@@ -179,15 +178,15 @@ pthread_rwlock_unlock (pthread_rwlock_t *rwlock)
{
/* Restart all waiting readers. */
torestart = rwlock->rw_read_waiting;
queue_init (&rwlock->rw_read_waiting);
release (&rwlock->rw_spinlock);
rwlock->rw_read_waiting = NULL;
__pthread_unlock (&rwlock->rw_lock);
while ((th = dequeue (&torestart)) != NULL)
restart (th);
}
else
{
/* Restart one waiting writer. */
release (&rwlock->rw_spinlock);
__pthread_unlock (&rwlock->rw_lock);
restart (th);
}
}
@@ -196,7 +195,7 @@ pthread_rwlock_unlock (pthread_rwlock_t *rwlock)
/* Unlocking a read lock. */
if (rwlock->rw_readers == 0)
{
release (&rwlock->rw_spinlock);
__pthread_unlock (&rwlock->rw_lock);
return EPERM;
}
@@ -207,7 +206,7 @@ pthread_rwlock_unlock (pthread_rwlock_t *rwlock)
else
th = NULL;
release (&rwlock->rw_spinlock);
__pthread_unlock (&rwlock->rw_lock);
if (th != NULL)
restart (th);
}