| 1 | // This test is intended to create a situation in which one thread will exit |
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| 2 | // while a breakpoint is being handled in another thread. This may not always |
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| 3 | // happen because it's possible that the exiting thread will exit before the |
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| 4 | // breakpoint is hit. The test case should be flexible enough to treat that |
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| 5 | // as success. |
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| 6 | |
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| 7 | #include "pseudo_barrier.h" |
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| 8 | #include <chrono> |
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| 9 | #include <thread> |
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| 10 | |
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| 11 | volatile int g_test = 0; |
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| 12 | |
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| 13 | // A barrier to synchronize all the threads except the one that will exit. |
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| 14 | pseudo_barrier_t g_barrier1; |
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| 15 | |
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| 16 | // A barrier to synchronize all the threads including the one that will exit. |
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| 17 | pseudo_barrier_t g_barrier2; |
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| 18 | |
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| 19 | // A barrier to keep the first group of threads from exiting until after the |
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| 20 | // breakpoint has been passed. |
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| 21 | pseudo_barrier_t g_barrier3; |
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| 22 | |
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| 23 | void * |
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| 24 | break_thread_func () |
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| 25 | { |
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| 26 | // Wait until the entire first group of threads is running |
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| 27 | pseudo_barrier_wait(g_barrier1); |
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| 28 | |
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| 29 | // Wait for the exiting thread to start |
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| 30 | pseudo_barrier_wait(g_barrier2); |
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| 31 | |
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| 32 | // Do something |
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| 33 | g_test++; // Set breakpoint here |
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| 34 | |
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| 35 | // Synchronize after the breakpoint |
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| 36 | pseudo_barrier_wait(g_barrier3); |
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| 37 | |
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| 38 | // Return |
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| 39 | return NULL; |
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| 40 | } |
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| 41 | |
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| 42 | void * |
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| 43 | wait_thread_func () |
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| 44 | { |
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| 45 | // Wait until the entire first group of threads is running |
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| 46 | pseudo_barrier_wait(g_barrier1); |
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| 47 | |
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| 48 | // Wait for the exiting thread to start |
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| 49 | pseudo_barrier_wait(g_barrier2); |
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| 50 | |
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| 51 | // Wait until the breakpoint has been passed |
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| 52 | pseudo_barrier_wait(g_barrier3); |
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| 53 | |
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| 54 | // Return |
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| 55 | return NULL; |
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| 56 | } |
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| 57 | |
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| 58 | void * |
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| 59 | exit_thread_func () |
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| 60 | { |
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| 61 | // Sync up with the rest of the threads. |
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| 62 | pseudo_barrier_wait(g_barrier2); |
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| 63 | |
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| 64 | // Try to make sure this thread doesn't exit until the breakpoint is hit. |
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| 65 | std::this_thread::sleep_for(rtime: std::chrono::microseconds(1)); |
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| 66 | |
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| 67 | // Return |
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| 68 | return NULL; |
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| 69 | } |
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| 70 | |
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| 71 | int main () |
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| 72 | { |
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| 73 | |
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| 74 | // The first barrier waits for the non-exiting threads to start. |
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| 75 | // This thread will also participate in that barrier. |
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| 76 | // The idea here is to guarantee that the exiting thread will be |
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| 77 | // last in the internal list maintained by the debugger. |
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| 78 | pseudo_barrier_init(g_barrier1, 5); |
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| 79 | |
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| 80 | // The second break synchronizes thread execution with the breakpoint. |
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| 81 | pseudo_barrier_init(g_barrier2, 5); |
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| 82 | |
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| 83 | // The third barrier keeps the waiting threads around until the breakpoint |
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| 84 | // has been passed. |
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| 85 | pseudo_barrier_init(g_barrier3, 4); |
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| 86 | |
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| 87 | // Create a thread to hit the breakpoint |
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| 88 | std::thread thread_1(break_thread_func); |
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| 89 | |
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| 90 | // Create more threads to slow the debugger down during processing. |
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| 91 | std::thread thread_2(wait_thread_func); |
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| 92 | std::thread thread_3(wait_thread_func); |
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| 93 | std::thread thread_4(wait_thread_func); |
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| 94 | |
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| 95 | // Wait for all these threads to get started. |
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| 96 | pseudo_barrier_wait(g_barrier1); |
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| 97 | |
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| 98 | // Create a thread to exit during the breakpoint |
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| 99 | std::thread thread_5(exit_thread_func); |
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| 100 | |
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| 101 | // Wait for the threads to finish |
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| 102 | thread_5.join(); |
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| 103 | thread_4.join(); |
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| 104 | thread_3.join(); |
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| 105 | thread_2.join(); |
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| 106 | thread_1.join(); |
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| 107 | |
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| 108 | return 0; |
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| 109 | } |
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| 110 | |
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