sync-block-copy.cpp
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// This test verifies that dispatch_sync() doesn't actually copy the block under TSan (without TSan, it doesn't).
// RUN: %clangxx_tsan %s -o %t_no_tsan -fno-sanitize=thread
// RUN: %clangxx_tsan %s -o %t_with_tsan
// RUN: %run %t_no_tsan 2>&1 | FileCheck %s
// RUN: %run %t_with_tsan 2>&1 | FileCheck %s --implicit-check-not='ThreadSanitizer'
#include <dispatch/dispatch.h>
#include <stdio.h>
struct MyClass {
static int copyCount;
static void printCopyCount() {
fprintf(stderr, "copyCount = %d\n", copyCount);
}
MyClass(){};
MyClass(const MyClass &obj) { copyCount++; };
void foo() const {
fprintf(stderr, "MyClass::foo\n");
}
};
int MyClass::copyCount = 0;
int main(int argc, const char* argv[]) {
dispatch_queue_t q = dispatch_queue_create("my.queue", NULL);
MyClass obj;
MyClass::printCopyCount();
void (^block)(void) = ^{
obj.foo();
};
MyClass::printCopyCount();
dispatch_sync(q, block);
MyClass::printCopyCount();
fprintf(stderr, "Done.\n");
return 0;
}
// CHECK: copyCount = 0
// CHECK: copyCount = 1
// CHECK: MyClass::foo
// CHECK: copyCount = 1
// CHECK: Done.