05ee22e31d
This relands commit r339405 (reverted in commit r339408.) The original revert was due to tests failing on a darwin buildbot; however, after looking at the affected code more I realized that the Darwin safestack support has always been broken and disabled it in r339719. This relands the original commit. llvm-svn: 339723
47 lines
947 B
C
47 lines
947 B
C
// RUN: %clang_safestack %s -pthread -o %t
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// RUN: %run %t 0
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// RUN: not --crash %run %t 1
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// Test unsafe stack deallocation. Unsafe stacks are not deallocated immediately
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// at thread exit. They are deallocated by following exiting threads.
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#include <stdlib.h>
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#include <string.h>
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#include <pthread.h>
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enum { kBufferSize = (1 << 15) };
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void *start(void *ptr)
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{
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char buffer[kBufferSize];
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return buffer;
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}
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int main(int argc, char **argv)
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{
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int arg = atoi(argv[1]);
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pthread_t t1, t2;
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char *t1_buffer = NULL;
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if (pthread_create(&t1, NULL, start, NULL))
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abort();
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if (pthread_join(t1, &t1_buffer))
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abort();
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memset(t1_buffer, 0, kBufferSize);
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if (arg == 0)
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return 0;
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if (pthread_create(&t2, NULL, start, NULL))
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abort();
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// Second thread destructor cleans up the first thread's stack.
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if (pthread_join(t2, NULL))
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abort();
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// should segfault here
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memset(t1_buffer, 0, kBufferSize);
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return 0;
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}
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