Index: compiler-rt/trunk/test/tsan/Darwin/gcd-fd.mm
===================================================================
--- compiler-rt/trunk/test/tsan/Darwin/gcd-fd.mm
+++ compiler-rt/trunk/test/tsan/Darwin/gcd-fd.mm
@@ -11,9 +11,9 @@
   dispatch_queue_t queue = dispatch_queue_create("my.queue", DISPATCH_QUEUE_SERIAL);
   dispatch_semaphore_t sem = dispatch_semaphore_create(0);
 
-  NSString *path = [NSTemporaryDirectory() stringByAppendingPathComponent:[NSString stringWithFormat:@"temp-gcd-io.%d", getpid()]];
+  const char *path = tempnam(NULL, "libdispatch-fd-");
 
-  dispatch_io_t channel = dispatch_io_create_with_path(DISPATCH_IO_STREAM, path.fileSystemRepresentation, O_CREAT | O_WRONLY,
+  dispatch_io_t channel = dispatch_io_create_with_path(DISPATCH_IO_STREAM, path, O_CREAT | O_WRONLY,
       0666, queue, ^(int error) { });
   dispatch_io_set_high_water(channel, 1);
 
@@ -34,7 +34,7 @@
   dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER);
   my_global++;
   dispatch_io_close(channel, 0);
-  channel = dispatch_io_create_with_path(DISPATCH_IO_STREAM, path.fileSystemRepresentation, O_RDONLY,
+  channel = dispatch_io_create_with_path(DISPATCH_IO_STREAM, path, O_RDONLY,
       0, queue, ^(int error) { });
   dispatch_io_set_high_water(channel, 1);
 
Index: compiler-rt/trunk/test/tsan/Darwin/gcd-io-barrier-race.mm
===================================================================
--- compiler-rt/trunk/test/tsan/Darwin/gcd-io-barrier-race.mm
+++ compiler-rt/trunk/test/tsan/Darwin/gcd-io-barrier-race.mm
@@ -19,8 +19,7 @@
 
   queue = dispatch_queue_create("my.queue", DISPATCH_QUEUE_CONCURRENT);
   sem = dispatch_semaphore_create(0);
-  NSString *ns_path = [NSTemporaryDirectory() stringByAppendingPathComponent:[NSString stringWithFormat:@"temp-gcd-io.%d", getpid()]];
-  path = ns_path.fileSystemRepresentation;
+  path = tempnam(NULL, "libdispatch-io-barrier-race-");
   char buf[1000];
   data = dispatch_data_create(buf, sizeof(buf), NULL, DISPATCH_DATA_DESTRUCTOR_DEFAULT);
   
Index: compiler-rt/trunk/test/tsan/Darwin/gcd-io-barrier.mm
===================================================================
--- compiler-rt/trunk/test/tsan/Darwin/gcd-io-barrier.mm
+++ compiler-rt/trunk/test/tsan/Darwin/gcd-io-barrier.mm
@@ -15,8 +15,7 @@
   
   queue = dispatch_queue_create("my.queue", DISPATCH_QUEUE_CONCURRENT);
   sem = dispatch_semaphore_create(0);
-  NSString *ns_path = [NSTemporaryDirectory() stringByAppendingPathComponent:[NSString stringWithFormat:@"temp-gcd-io.%d", getpid()]];
-  path = ns_path.fileSystemRepresentation;
+  path = tempnam(NULL, "libdispatch-io-barrier");
   char buf[1000];
   data = dispatch_data_create(buf, sizeof(buf), NULL, DISPATCH_DATA_DESTRUCTOR_DEFAULT);
   
Index: compiler-rt/trunk/test/tsan/Darwin/gcd-io-cleanup.mm
===================================================================
--- compiler-rt/trunk/test/tsan/Darwin/gcd-io-cleanup.mm
+++ compiler-rt/trunk/test/tsan/Darwin/gcd-io-cleanup.mm
@@ -10,8 +10,7 @@
   
   dispatch_queue_t queue = dispatch_queue_create("my.queue", DISPATCH_QUEUE_CONCURRENT);
   dispatch_semaphore_t sem = dispatch_semaphore_create(0);
-  NSString *ns_path = [NSTemporaryDirectory() stringByAppendingPathComponent:[NSString stringWithFormat:@"temp-gcd-io.%d", getpid()]];
-  const char *path = ns_path.fileSystemRepresentation;
+  const char *path = tempnam(NULL, "libdispatch-io-cleanup-");
   dispatch_io_t channel;
   
   dispatch_fd_t fd = open(path, O_CREAT | O_WRONLY, 0666);
Index: compiler-rt/trunk/test/tsan/Darwin/gcd-io-race.mm
===================================================================
--- compiler-rt/trunk/test/tsan/Darwin/gcd-io-race.mm
+++ compiler-rt/trunk/test/tsan/Darwin/gcd-io-race.mm
@@ -21,8 +21,7 @@
   
   queue = dispatch_queue_create("my.queue", DISPATCH_QUEUE_CONCURRENT);
   sem = dispatch_semaphore_create(0);
-  NSString *ns_path = [NSTemporaryDirectory() stringByAppendingPathComponent:[NSString stringWithFormat:@"temp-gcd-io.%d", getpid()]];
-  path = ns_path.fileSystemRepresentation;
+  path = tempnam(NULL, "libdispatch-io-race");
   char buf[1000];
   data = dispatch_data_create(buf, sizeof(buf), NULL, DISPATCH_DATA_DESTRUCTOR_DEFAULT);
   
Index: compiler-rt/trunk/test/tsan/Darwin/gcd-io.mm
===================================================================
--- compiler-rt/trunk/test/tsan/Darwin/gcd-io.mm
+++ compiler-rt/trunk/test/tsan/Darwin/gcd-io.mm
@@ -98,8 +98,7 @@
   
   queue = dispatch_queue_create("my.queue", DISPATCH_QUEUE_SERIAL);
   sem = dispatch_semaphore_create(0);
-  NSString *ns_path = [NSTemporaryDirectory() stringByAppendingPathComponent:[NSString stringWithFormat:@"temp-gcd-io.%d", getpid()]];
-  path = ns_path.fileSystemRepresentation;
+  path = tempnam(NULL, "libdispatch-io-");
   char buf[1000];
   data = dispatch_data_create(buf, sizeof(buf), NULL, DISPATCH_DATA_DESTRUCTOR_DEFAULT);