forked from OSchip/llvm-project
87 lines
2.1 KiB
C
87 lines
2.1 KiB
C
// Test that mach_vm_[de]allocate resets shadow memory status.
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//
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// RUN: %clang_tsan %s -o %t
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// RUN: %run %t 2>&1 | FileCheck %s --implicit-check-not='ThreadSanitizer'
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#include <mach/mach.h>
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#include <mach/mach_vm.h>
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#include <pthread.h>
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#include <assert.h>
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#include <stdio.h>
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#include "../test.h"
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const mach_vm_size_t alloc_size = sizeof(int);
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static int *global_ptr;
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static int *alloc() {
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mach_vm_address_t addr;
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kern_return_t kr =
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mach_vm_allocate(mach_task_self(), &addr, alloc_size, VM_FLAGS_ANYWHERE);
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assert(kr == KERN_SUCCESS);
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return (int *)addr;
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}
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static void alloc_fixed(int *ptr) {
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mach_vm_address_t addr = (mach_vm_address_t)ptr;
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// Re-allocation via VM_FLAGS_FIXED sporadically fails.
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kern_return_t kr =
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mach_vm_allocate(mach_task_self(), &addr, alloc_size, VM_FLAGS_FIXED);
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if (kr != KERN_SUCCESS)
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global_ptr = NULL;
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}
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static void dealloc(int *ptr) {
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kern_return_t kr =
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mach_vm_deallocate(mach_task_self(), (mach_vm_address_t)ptr, alloc_size);
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assert(kr == KERN_SUCCESS);
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}
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static void *Thread(void *arg) {
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*global_ptr = 7; // Assignment 1
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// We want to test that TSan does not report a race between the two
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// assignments to *global_ptr when the underlying memory is re-allocated
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// between assignments. The calls to the API itself are racy though, so ignore
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// them.
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AnnotateIgnoreWritesBegin(__FILE__, __LINE__);
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dealloc(global_ptr);
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alloc_fixed(global_ptr);
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AnnotateIgnoreWritesEnd(__FILE__, __LINE__);
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barrier_wait(&barrier);
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return NULL;
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}
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static bool try_realloc_on_same_address() {
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barrier_init(&barrier, 2);
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global_ptr = alloc();
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pthread_t t;
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pthread_create(&t, NULL, Thread, NULL);
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barrier_wait(&barrier);
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if (global_ptr)
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*global_ptr = 8; // Assignment 2
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pthread_join(t, NULL);
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dealloc(global_ptr);
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return global_ptr != NULL;
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}
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int main(int argc, const char *argv[]) {
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bool success;
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for (int i = 0; i < 10; i++) {
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success = try_realloc_on_same_address();
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if (success) break;
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}
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if (!success)
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fprintf(stderr, "Unable to set up testing condition; silently pass test\n");
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printf("Done.\n");
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return 0;
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}
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// CHECK: Done.
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