83 строки
1.9 KiB
C++
83 строки
1.9 KiB
C++
#include <pthread.h>
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#include <sys/types.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <unistd.h>
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#include <errno.h>
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#include <signal.h>
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#include <emscripten.h>
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#include <emscripten/threading.h>
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volatile int sharedVar = 0;
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static void *thread_start(void *arg)
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{
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// As long as this thread is running, keep the shared variable latched to nonzero value.
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for(;;)
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{
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++sharedVar;
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emscripten_atomic_store_u32((void*)&sharedVar, sharedVar+1);
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}
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pthread_exit(0);
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}
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pthread_t thr;
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void BusySleep(double msecs)
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{
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double t0 = emscripten_get_now();
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while(emscripten_get_now() < t0 + msecs);
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}
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int main()
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{
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int result;
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if (!emscripten_has_threading_support())
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{
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#ifdef REPORT_RESULT
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result = 0;
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REPORT_RESULT();
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#endif
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printf("Skipped: Threading is not supported.\n");
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return 0;
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}
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sharedVar = 0;
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int s = pthread_create(&thr, NULL, thread_start, 0);
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assert(s == 0);
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// Wait until thread kicks in and sets the shared variable.
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while(sharedVar == 0)
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BusySleep(10);
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s = pthread_kill(thr, SIGKILL);
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assert(s == 0);
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// Wait until we see the shared variable stop incrementing. (This is a bit heuristic and hacky)
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for(;;)
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{
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int val = emscripten_atomic_load_u32((void*)&sharedVar);
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BusySleep(100);
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int val2 = emscripten_atomic_load_u32((void*)&sharedVar);
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if (val == val2) break;
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}
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// Reset to 0.
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sharedVar = 0;
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emscripten_atomic_store_u32((void*)&sharedVar, 0);
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// Wait for a long time, if the thread is still running, it should progress and set sharedVar by this time.
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BusySleep(3000);
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// Finally test that the thread is not doing any work and it is dead.
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assert(sharedVar == 0);
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assert(emscripten_atomic_load_u32((void*)&sharedVar) == 0);
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EM_ASM_INT( { Module['print']('Main: Done. Successfully killed thread. sharedVar: '+$0+'.'); }, sharedVar);
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#ifdef REPORT_RESULT
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result = sharedVar;
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REPORT_RESULT();
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#endif
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}
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