X-Git-Url: http://nsz.repo.hu/git/?p=musl;a=blobdiff_plain;f=src%2Fthread%2Fpthread_create.c;h=92ce9ffb5d6e7852445de7eb1bb0d03571132b6b;hp=52b48d6f17e39767c36ff7d78f6a612f055dc9d2;hb=dcd60371500a74d489372cac7240674c992c2484;hpb=2d93d6446191def352b8913e859d6104f1398c72

diff --git a/src/thread/pthread_create.c b/src/thread/pthread_create.c
index 52b48d6f..92ce9ffb 100644
--- a/src/thread/pthread_create.c
+++ b/src/thread/pthread_create.c
@@ -4,11 +4,11 @@
 static void dummy_0()
 {
 }
-weak_alias(dummy_0, __synccall_lock);
-weak_alias(dummy_0, __synccall_unlock);
+weak_alias(dummy_0, __acquire_ptc);
+weak_alias(dummy_0, __release_ptc);
 weak_alias(dummy_0, __pthread_tsd_run_dtors);
 
-void pthread_exit(void *result)
+_Noreturn void pthread_exit(void *result)
 {
 	pthread_t self = pthread_self();
 	int n;
@@ -43,7 +43,7 @@ void pthread_exit(void *result)
 		__unmapself(self->map_base, self->map_size);
 	}
 
-	__syscall(SYS_exit, 0);
+	for (;;) __syscall(SYS_exit, 0);
 }
 
 void __do_cleanup_push(struct __ptcb *cb)
@@ -84,7 +84,9 @@ static void init_file_lock(FILE *f)
 	if (f && f->lock<0) f->lock = 0;
 }
 
-int pthread_create(pthread_t *res, const pthread_attr_t *attr, void *(*entry)(void *), void *arg)
+void *__copy_tls(unsigned char *);
+
+int pthread_create(pthread_t *restrict res, const pthread_attr_t *restrict attr, void *(*entry)(void *), void *restrict arg)
 {
 	int ret;
 	size_t size = DEFAULT_STACK_SIZE + DEFAULT_GUARD_SIZE;
@@ -103,21 +105,32 @@ int pthread_create(pthread_t *res, const pthread_attr_t *attr, void *(*entry)(vo
 		libc.threaded = 1;
 	}
 
+	__acquire_ptc();
+
 	if (attr && attr->_a_stackaddr) {
 		map = 0;
 		tsd = (void *)(attr->_a_stackaddr-__pthread_tsd_size & -16);
 	} else {
 		if (attr) {
 			guard = ROUND(attr->_a_guardsize + DEFAULT_GUARD_SIZE);
-			size = guard + ROUND(attr->_a_stacksize + DEFAULT_STACK_SIZE);
+			size = guard + ROUND(attr->_a_stacksize
+				+ DEFAULT_STACK_SIZE + libc.tls_size);
 		}
 		size += __pthread_tsd_size;
-		map = mmap(0, size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0);
-		if (map == MAP_FAILED) return EAGAIN;
-		if (guard) mprotect(map, guard, PROT_NONE);
+		if (guard) {
+			map = mmap(0, size, PROT_NONE, MAP_PRIVATE|MAP_ANON, -1, 0);
+			if (map == MAP_FAILED) return EAGAIN;
+			if (mprotect(map+guard, size-guard, PROT_READ|PROT_WRITE)) {
+				munmap(map, size);
+				return EAGAIN;
+			}
+		} else {
+			map = mmap(0, size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0);
+			if (map == MAP_FAILED) return EAGAIN;
+		}
 		tsd = map + size - __pthread_tsd_size;
 	}
-	new = (void *)(tsd - sizeof *new - PAGE_SIZE%sizeof *new);
+	new = __copy_tls(tsd - libc.tls_size);
 	new->map_base = map;
 	new->map_size = size;
 	new->pid = self->pid;
@@ -134,12 +147,10 @@ int pthread_create(pthread_t *res, const pthread_attr_t *attr, void *(*entry)(vo
 	new->canary = self->canary ^ (uintptr_t)&new;
 	stack = (void *)new;
 
-	__synccall_lock();
-
 	a_inc(&libc.threads_minus_1);
 	ret = __clone(start, stack, flags, new, &new->tid, new, &new->tid);
 
-	__synccall_unlock();
+	__release_ptc();
 
 	if (ret < 0) {
 		a_dec(&libc.threads_minus_1);