| // RUN: %clangxx_tsan -O0 %s -o %t |
| // RUN: not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-RACE |
| // RUN: %run %t ignore 2>&1 | FileCheck %s --check-prefix=CHECK-IGNORE |
| // XFAIL: freebsd,netbsd |
| |
| #include <sys/mman.h> |
| #include <string.h> |
| #include <assert.h> |
| #include <atomic> |
| |
| #include "test.h" |
| |
| extern "C" { |
| void AnnotateIgnoreReadsBegin(const char *f, int l); |
| void AnnotateIgnoreReadsEnd(const char *f, int l); |
| void AnnotateIgnoreWritesBegin(const char *f, int l); |
| void AnnotateIgnoreWritesEnd(const char *f, int l); |
| } |
| |
| // Use atomic to ensure we do not have a race for the pointer value itself. We |
| // only want to check races in the mmap'd memory to isolate the test that mmap |
| // respects ignore annotations. |
| std::atomic<int*> global_p; |
| |
| void mmap_ignored(bool ignore) { |
| const size_t kSize = sysconf(_SC_PAGESIZE); |
| |
| if (ignore) AnnotateIgnoreWritesBegin(__FILE__, __LINE__); |
| void *p = mmap(0, kSize, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0); |
| if (ignore) AnnotateIgnoreWritesEnd(__FILE__, __LINE__); |
| |
| // Use relaxed to retain the race between the mmap call and the memory write |
| global_p.store((int *)p, std::memory_order_relaxed); |
| barrier_wait(&barrier); |
| } |
| |
| void *WriteToMemory(void *unused) { |
| barrier_wait(&barrier); |
| global_p[0] = 7; |
| return 0; |
| } |
| |
| // Create race between allocating (mmap) and writing memory |
| int main(int argc, const char *argv[]) { |
| bool ignore = (argc > 1) && (strcmp(argv[1], "ignore") == 0); |
| |
| barrier_init(&barrier, 2); |
| pthread_t t; |
| pthread_create(&t, 0, WriteToMemory, 0); |
| mmap_ignored(ignore); |
| pthread_join(t, 0); |
| |
| assert(global_p[0] == 7); |
| printf("OK\n"); |
| return 0; |
| } |
| |
| // CHECK-RACE: WARNING: ThreadSanitizer: data race |
| // CHECK-RACE: OK |
| // CHECK-IGNORE-NOT: WARNING: ThreadSanitizer: data race |
| // CHECK-IGNORE: OK |