X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;ds=sidebyside;f=src%2Fthread%2Fpthread_barrier_wait.c;h=cc2a8bbf58a9cfee193d7f30bf2bcfd778debe7a;hb=bf14ef193b4203aa9a8b173faeeea06d98397f65;hp=6052925a819a5280f627572d8a6b6455dcfa0b71;hpb=de543b05c87d79a9313991810e9ee8ecdaad8f19;p=musl

diff --git a/src/thread/pthread_barrier_wait.c b/src/thread/pthread_barrier_wait.c
index 6052925a..cc2a8bbf 100644
--- a/src/thread/pthread_barrier_wait.c
+++ b/src/thread/pthread_barrier_wait.c
@@ -1,23 +1,5 @@
 #include "pthread_impl.h"
 
-static int vmlock[2];
-
-void __vm_lock(int inc)
-{
-	for (;;) {
-		int v = vmlock[0];
-		if (inc*v < 0) __wait(vmlock, vmlock+1, v, 1);
-		else if (a_cas(vmlock, v, v+inc)==v) break;
-	}
-}
-
-void __vm_unlock(void)
-{
-	int inc = vmlock[0]>0 ? -1 : 1;
-	if (a_fetch_add(vmlock, inc)==-inc && vmlock[1])
-		__wake(vmlock, -1, 1);
-}
-
 static int pshared_barrier_wait(pthread_barrier_t *b)
 {
 	int limit = (b->_b_limit & INT_MAX) + 1;
@@ -41,7 +23,7 @@ static int pshared_barrier_wait(pthread_barrier_t *b)
 			__wait(&b->_b_count, &b->_b_waiters2, v, 0);
 	}
 
-	__vm_lock(+1);
+	__vm_lock();
 
 	/* Ensure all threads have a vm lock before proceeding */
 	if (a_fetch_add(&b->_b_count, -1)==1-limit) {
@@ -69,10 +51,10 @@ static int pshared_barrier_wait(pthread_barrier_t *b)
 
 struct instance
 {
-	int count;
-	int last;
-	int waiters;
-	int finished;
+	volatile int count;
+	volatile int last;
+	volatile int waiters;
+	volatile int finished;
 };
 
 int pthread_barrier_wait(pthread_barrier_t *b)
@@ -94,7 +76,7 @@ int pthread_barrier_wait(pthread_barrier_t *b)
 	/* First thread to enter the barrier becomes the "instance owner" */
 	if (!inst) {
 		struct instance new_inst = { 0 };
-		int spins = 10000;
+		int spins = 200;
 		b->_b_inst = inst = &new_inst;
 		a_store(&b->_b_lock, 0);
 		if (b->_b_waiters) __wake(&b->_b_lock, 1, 1);
@@ -102,7 +84,8 @@ int pthread_barrier_wait(pthread_barrier_t *b)
 			a_spin();
 		a_inc(&inst->finished);
 		while (inst->finished == 1)
-			__syscall(SYS_futex, &inst->finished, FUTEX_WAIT,1,0);
+			__syscall(SYS_futex,&inst->finished,FUTEX_WAIT|FUTEX_PRIVATE,1,0) != -ENOSYS
+			|| __syscall(SYS_futex,&inst->finished,FUTEX_WAIT,1,0);
 		return PTHREAD_BARRIER_SERIAL_THREAD;
 	}