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Update.

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2003-04-04  Ulrich Drepper  <drepper@redhat.com>

	* sysdeps/pthread/createthread.c (create_thread): Add some more
	comments explaining when to set multiple_threads and when not.

	* pthreadP.h: Define THREAD_ATOMIC_CMPXCHG_VAL and
	THREAD_ATOMIC_BIT_SET if not already defined.
	* sysdeps/i386/tls.h: Define THREAD_ATOMIC_CMPXCHG_VAL and
	THREAD_ATOMIC_BIT_SET:
	* sysdeps/x86_64/tls.h: Likewise.
	* cleanup_defer.c (_pthread_cleanup_push_defer): Rewrite to use
	THREAD_ATOMIC_CMPXCHG_VAL.
	(_pthread_cleanup_pop_restore): Likewise.
	* cancellation.c (__pthread_enable_asynccancel): Likewise.
	(__pthread_enable_asynccancel_2): Likewise.
	(__pthread_disable_asynccancel): Likewise.
	* libc-cancellation.c (__libc_enable_asynccancel): Likewise.
	(__libc_disable_asynccancel): Likewise.
	* init.c (sigcancel_handler): Likewise.
	* pthread_setcancelstate.c (__pthread_setcancelstate): Likewise.
	* pthread_setcanceltype.c (__pthread_setcanceltype): Likewise.
This commit is contained in:
Ulrich Drepper
2003-04-05 05:21:15 +00:00
parent 3242201746
commit b22d701bb7
10 changed files with 188 additions and 56 deletions
Download Patch File Download Diff File Expand all files Collapse all files

48
nptl/libc-cancellation.c
View File

@ -33,13 +33,11 @@ attribute_hidden
__libc_enable_asynccancel (void)
{
struct pthread *self = THREAD_SELF;
int oldval;
int newval;
int oldval = THREAD_GETMEM (self, cancelhandling);
do
while (1)
{
oldval = THREAD_GETMEM (self, cancelhandling);
newval = oldval | CANCELTYPE_BITMASK;
int newval = oldval | CANCELTYPE_BITMASK;
if (__builtin_expect ((oldval & CANCELED_BITMASK) != 0, 0))
{
@ -47,10 +45,14 @@ __libc_enable_asynccancel (void)
if ((oldval & EXITING_BITMASK) != 0)
break;
if (atomic_compare_and_exchange_bool_acq (&self->cancelhandling,
newval, oldval))
/* Somebody else modified the word, try again. */
continue;
int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling,
newval, oldval);
if (__builtin_expect (curval != oldval, 0))
{
/* Somebody else modified the word, try again. */
oldval = curval;
continue;
}
THREAD_SETMEM (self, result, PTHREAD_CANCELED);
@ -58,9 +60,15 @@ __libc_enable_asynccancel (void)
/* NOTREACHED */
}
int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling, newval,
oldval);
if (__builtin_expect (curval == oldval, 1))
break;
/* Prepare the next round. */
oldval = curval;
}
while (atomic_compare_and_exchange_bool_acq (&self->cancelhandling,
newval, oldval));
return oldval;
}
@ -76,19 +84,23 @@ __libc_disable_asynccancel (int oldtype)
return;
struct pthread *self = THREAD_SELF;
int oldval;
int newval;
int oldval = THREAD_GETMEM (self, cancelhandling);
do
while (1)
{
oldval = THREAD_GETMEM (self, cancelhandling);
newval = oldval & ~CANCELTYPE_BITMASK;
int newval = oldval & ~CANCELTYPE_BITMASK;
if (newval == oldval)
break;
int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling, newval,
oldval);
if (__builtin_expect (curval == oldval, 1))
break;
/* Prepare the next round. */
oldval = curval;
}
while (atomic_compare_and_exchange_bool_acq (&self->cancelhandling, newval,
oldval));
}
#endif