[compiler-rt] 0163329 - [TSan] Make `mach_vm_allocate.c` test less flaky
Julian Lettner via llvm-commits
llvm-commits at lists.llvm.org
Thu Nov 21 15:20:14 PST 2019
Author: Julian Lettner
Date: 2019-11-21T15:19:31-08:00
New Revision: 0163329dbd6c687453a27f72e21512a8c151c5b3
URL: https://github.com/llvm/llvm-project/commit/0163329dbd6c687453a27f72e21512a8c151c5b3
DIFF: https://github.com/llvm/llvm-project/commit/0163329dbd6c687453a27f72e21512a8c151c5b3.diff
LOG: [TSan] Make `mach_vm_allocate.c` test less flaky
rdar://57365733
Added:
Modified:
compiler-rt/test/tsan/Darwin/mach_vm_allocate.c
Removed:
################################################################################
diff --git a/compiler-rt/test/tsan/Darwin/mach_vm_allocate.c b/compiler-rt/test/tsan/Darwin/mach_vm_allocate.c
index 5b1235201bd9..2eab03f81a01 100644
--- a/compiler-rt/test/tsan/Darwin/mach_vm_allocate.c
+++ b/compiler-rt/test/tsan/Darwin/mach_vm_allocate.c
@@ -24,9 +24,11 @@ static int *alloc() {
static void alloc_fixed(int *ptr) {
mach_vm_address_t addr = (mach_vm_address_t)ptr;
- kern_return_t res =
- mach_vm_allocate(mach_task_self(), &addr, alloc_size, VM_FLAGS_FIXED);
- assert(res == KERN_SUCCESS);
+ kern_return_t res;
+ // Re-allocation via VM_FLAGS_FIXED sporadically fails.
+ do {
+ res = mach_vm_allocate(mach_task_self(), &addr, alloc_size, VM_FLAGS_FIXED);
+ } while (res != KERN_SUCCESS);
}
static void dealloc(int *ptr) {
@@ -39,8 +41,9 @@ static void *Thread(void *arg) {
*global_ptr = 7; // Assignment 1
// We want to test that TSan does not report a race between the two
- // assignments to global_ptr when memory is re-allocated here. The calls to
- // the API itself are racy though, so ignore them.
+ // assignments to *global_ptr when the underlying memory is re-allocated
+ // between assignments. The calls to the API itself are racy though, so ignore
+ // them.
AnnotateIgnoreWritesBegin(__FILE__, __LINE__);
dealloc(global_ptr);
alloc_fixed(global_ptr);
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