X-Git-Url: http://nsz.repo.hu/git/?p=musl;a=blobdiff_plain;f=src%2Fthread%2Fpthread_create.c;h=627ff5fbbe087cea6782eb8a9703aa389061ff5e;hp=d8b8f0fcf8383ce3db3cddb833983c077e904f7e;hb=42c36f957d54926eec87b072a73439b9a1539347;hpb=0c05bd3a9c165cf2f0b9d6fa23a1f96532ddcdb3

diff --git a/src/thread/pthread_create.c b/src/thread/pthread_create.c
index d8b8f0fc..627ff5fb 100644
--- a/src/thread/pthread_create.c
+++ b/src/thread/pthread_create.c
@@ -4,8 +4,8 @@
 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);
 
 _Noreturn void pthread_exit(void *result)
@@ -84,6 +84,8 @@ static void init_file_lock(FILE *f)
 	if (f && f->lock<0) f->lock = 0;
 }
 
+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;
@@ -103,21 +105,32 @@ int pthread_create(pthread_t *restrict res, const pthread_attr_t *restrict attr,
 		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(stack = tsd - libc.tls_size);
 	new->map_base = map;
 	new->map_size = size;
 	new->pid = self->pid;
@@ -131,15 +144,12 @@ int pthread_create(pthread_t *restrict res, const pthread_attr_t *restrict attr,
 		flags -= 0x200000;
 	}
 	new->unblock_cancel = self->cancel;
-	new->canary = self->canary ^ (uintptr_t)&new;
-	stack = (void *)new;
-
-	__synccall_lock();
+	new->canary = self->canary;
 
 	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);