8778fea0bb
This eliminates portability issues among platforms that don't have a pthreads implementation. Differential Revision: http://reviews.llvm.org/D12043 Reviewed By: Greg Clayton llvm-svn: 245234
62 lines
1.6 KiB
C++
62 lines
1.6 KiB
C++
//===-- main.cpp ------------------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// This test is intended to create a situation in which a breakpoint will be
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// hit in two threads at nearly the same moment. The expected result is that
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// the breakpoint in the second thread will be hit while the breakpoint handler
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// in the first thread is trying to stop all threads.
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#include <atomic>
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#include <thread>
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// Note that although hogging the CPU while waiting for a variable to change
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// would be terrible in production code, it's great for testing since it
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// avoids a lot of messy context switching to get multiple threads synchronized.
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#define do_nothing()
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#define pseudo_barrier_wait(bar) \
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--bar; \
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while (bar > 0) \
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do_nothing();
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#define pseudo_barrier_init(bar, count) (bar = count)
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std::atomic_int g_barrier;
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volatile int g_test = 0;
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void *
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thread_func ()
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{
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// Wait until both threads are running
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pseudo_barrier_wait(g_barrier);
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// Do something
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g_test++; // Set breakpoint here
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// Return
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return NULL;
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}
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int main ()
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{
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// Don't let either thread do anything until they're both ready.
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pseudo_barrier_init(g_barrier, 2);
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// Create two threads
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std::thread thread_1(thread_func);
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std::thread thread_2(thread_func);
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// Wait for the threads to finish
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thread_1.join();
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thread_2.join();
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return 0;
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}
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