e4c1dd2c08
TSan recently got the "ignore_noninstrumented_modules" flag, which disables tracking of read and writes that come from noninstrumented modules (via interceptors). This is a way of suppressing false positives coming from system libraries and other noninstrumented code. This patch turns this on by default on Darwin, where it's supposed to replace the previous solution, "ignore_interceptors_accesses", which disables tracking in *all* interceptors. The new approach should re-enable TSan's ability to find races via interceptors on Darwin. Differential Revision: https://reviews.llvm.org/D29041 llvm-svn: 292981
35 lines
784 B
Plaintext
35 lines
784 B
Plaintext
// RUN: %clangxx_tsan %s -o %t -framework Foundation
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// RUN: %run %t 2>&1 | FileCheck %s
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#import <Foundation/Foundation.h>
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int main() {
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fprintf(stderr, "start\n");
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dispatch_queue_t background_q = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
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dispatch_queue_t main_q = dispatch_get_main_queue();
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dispatch_async(background_q, ^{
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__block long block_var = 0;
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dispatch_sync(main_q, ^{
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block_var = 42;
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});
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fprintf(stderr, "block_var = %ld\n", block_var);
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dispatch_sync(dispatch_get_main_queue(), ^{
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CFRunLoopStop(CFRunLoopGetCurrent());
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});
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});
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CFRunLoopRun();
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fprintf(stderr, "done\n");
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}
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// CHECK: start
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// CHECK: block_var = 42
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// CHECK: done
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// CHECK-NOT: WARNING: ThreadSanitizer
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// CHECK-NOT: CHECK failed
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