forked from OSchip/llvm-project
72 lines
1.7 KiB
C++
72 lines
1.7 KiB
C++
// RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
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// REQUIRES: linux
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#include "test.h"
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#include <pthread.h>
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#include <sys/types.h>
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#include <unistd.h>
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long count_memory_mappings() {
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pid_t my_pid = getpid();
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char proc_file_name[128];
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snprintf(proc_file_name, sizeof(proc_file_name), "/proc/%d/maps", my_pid);
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FILE *proc_file = fopen(proc_file_name, "r");
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long line_count = 0;
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int c;
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do {
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c = fgetc(proc_file);
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if (c == '\n') {
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line_count++;
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}
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} while (c != EOF);
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fclose(proc_file);
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return line_count;
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}
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void fiber_iteration() {
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void *orig_fiber = __tsan_get_current_fiber();
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void *fiber = __tsan_create_fiber(0);
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pthread_mutex_t mutex;
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pthread_mutex_init(&mutex, NULL);
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// Running some code on the fiber that triggers handling of pending signals.
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__tsan_switch_to_fiber(fiber, 0);
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pthread_mutex_lock(&mutex);
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pthread_mutex_unlock(&mutex);
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__tsan_switch_to_fiber(orig_fiber, 0);
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// We expect the fiber to clean up all resources (here the sigcontext) when destroyed.
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__tsan_destroy_fiber(fiber);
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}
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// Magic-Number for some warmup iterations,
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// as tsan maps some memory for the first runs.
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const size_t num_warmup = 100;
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int main() {
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for (size_t i = 0; i < num_warmup; i++) {
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fiber_iteration();
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}
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long memory_mappings_before = count_memory_mappings();
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fiber_iteration();
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fiber_iteration();
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long memory_mappings_after = count_memory_mappings();
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// Is there a better way to detect a resource leak in the
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// ThreadState object? (i.e. a mmap not being freed)
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if (memory_mappings_before == memory_mappings_after) {
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fprintf(stderr, "PASS\n");
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} else {
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fprintf(stderr, "FAILED\n");
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}
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return 0;
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}
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// CHECK-NOT: WARNING: ThreadSanitizer:
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// CHECK: PASS
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