forked from OSchip/llvm-project
36 lines
912 B
C++
36 lines
912 B
C++
// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
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#include <pthread.h>
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#include <unistd.h>
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pthread_rwlock_t rwlock;
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int GLOB;
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void *Thread1(void *p) {
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(void)p;
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pthread_rwlock_rdlock(&rwlock);
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// Write under reader lock.
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sleep(1);
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GLOB++;
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pthread_rwlock_unlock(&rwlock);
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return 0;
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}
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int main(int argc, char *argv[]) {
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pthread_rwlock_init(&rwlock, NULL);
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pthread_rwlock_rdlock(&rwlock);
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pthread_t t;
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pthread_create(&t, 0, Thread1, 0);
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volatile int x = GLOB;
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(void)x;
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pthread_rwlock_unlock(&rwlock);
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pthread_join(t, 0);
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pthread_rwlock_destroy(&rwlock);
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return 0;
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}
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// CHECK: WARNING: ThreadSanitizer: data race
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// CHECK: Write of size 4 at {{.*}} by thread T1{{.*}}:
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// CHECK: #0 Thread1(void*) {{.*}}write_in_reader_lock.cc:13
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// CHECK: Previous read of size 4 at {{.*}} by main thread{{.*}}:
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// CHECK: #0 main {{.*}}write_in_reader_lock.cc:23
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