95cd990588
Thread stack/TLS may be stored by libpthread for future reuse after thread destruction, and the linked list it's stored in doesn't even hold valid pointers to the objects, the latter are calculated by obscure pointer arithmetic. With this change applied, LSan test suite passes with "use_ld_allocations" flag defaulted to "false". It still requires more testing to check if the default can be switched. llvm-svn: 257975
50 lines
1.4 KiB
C++
50 lines
1.4 KiB
C++
// A benchmark that executes malloc/free pairs in parallel.
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// Usage: ./a.out number_of_threads total_number_of_allocations
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// RUN: LSAN_BASE="use_ld_allocations=0"
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// RUN: %clangxx_lsan %s -o %t
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// RUN: LSAN_OPTIONS=$LSAN_BASE %run %t 5 1000000 2>&1
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#include <assert.h>
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#include <pthread.h>
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#include <stdlib.h>
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#include <stdio.h>
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int num_threads;
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int total_num_alloc;
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const int kMaxNumThreads = 5000;
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pthread_t tid[kMaxNumThreads];
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pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
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pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
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bool go = false;
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void *thread_fun(void *arg) {
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pthread_mutex_lock(&mutex);
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while (!go) pthread_cond_wait(&cond, &mutex);
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pthread_mutex_unlock(&mutex);
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for (int i = 0; i < total_num_alloc / num_threads; i++) {
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void *p = malloc(10);
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__asm__ __volatile__("" : : "r"(p) : "memory");
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free((void *)p);
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}
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return 0;
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}
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int main(int argc, char** argv) {
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assert(argc == 3);
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num_threads = atoi(argv[1]);
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assert(num_threads > 0);
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assert(num_threads <= kMaxNumThreads);
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total_num_alloc = atoi(argv[2]);
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assert(total_num_alloc > 0);
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printf("%d threads, %d allocations in each\n", num_threads,
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total_num_alloc / num_threads);
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for (int i = 0; i < num_threads; i++)
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pthread_create(&tid[i], 0, thread_fun, 0);
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pthread_mutex_lock(&mutex);
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go = true;
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pthread_cond_broadcast(&cond);
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pthread_mutex_unlock(&mutex);
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for (int i = 0; i < num_threads; i++) pthread_join(tid[i], 0);
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return 0;
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}
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