forked from OSchip/llvm-project
52 lines
1.5 KiB
C++
52 lines
1.5 KiB
C++
// RUN: %clang_tsan -O1 %s -o %t && %env_tsan_opts=report_atomic_races=0 %run %t 2>&1 | FileCheck %s
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// This test exposed non-atomicity in mmap interceptor
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// which made shadow for the region temporarily unmapped.
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// This resulted in crashes in the Accesser thread.
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#include "test.h"
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#include <errno.h>
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#include <sys/mman.h>
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// The size needs to be large enough to trigger
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// large region optimization in the runtime.
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const size_t kMmapSize = 16 << 20;
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void *Remapper(void *arg) {
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for (;;) {
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void *p = mmap(arg, kMmapSize, PROT_READ | PROT_WRITE,
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MAP_FIXED | MAP_PRIVATE | MAP_ANON, -1, 0);
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if (p == MAP_FAILED)
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exit(printf("mmap failed: %d\n", errno));
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}
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return 0;
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}
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void *Accesser(void *arg) {
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unsigned rnd = time(0);
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for (;;) {
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int index = rand_r(&rnd) % kMmapSize;
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char *p = &((char *)arg)[index];
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__atomic_fetch_add(p, 1, __ATOMIC_ACQ_REL);
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}
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return 0;
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}
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int main() {
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void *p = mmap(0, kMmapSize, PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANON, -1, 0);
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if (p == MAP_FAILED)
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exit(printf("mmap failed: %d\n", errno));
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pthread_attr_t attr;
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pthread_attr_init(&attr);
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pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
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pthread_t th[2];
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if (pthread_create(&th[0], &attr, Remapper, p))
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exit(printf("pthread_create failed: %d\n", errno));
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if (pthread_create(&th[1], &attr, Accesser, p))
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exit(printf("pthread_create failed: %d\n", errno));
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pthread_attr_destroy(&attr);
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sleep(3);
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fprintf(stderr, "DONE\n");
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}
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// CHECK: DONE
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