xpcom/tests/TestAutoLock.cpp

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  37
  38 /*
  39
  40   Some tests for nsAutoLock.
  41
  42  */
  43
  44 #include "nsAutoLock.h"
  45 #include "prthread.h"
  46
  47 PRLock* gLock;
  48 int gCount;
  49
  50 static void PR_CALLBACK run(void* arg)
  51 {
  52     for (int i = 0; i < 1000000; ++i) {
  53         nsAutoLock guard(gLock);
  54         ++gCount;
  55         PR_ASSERT(gCount == 1);
  56         --gCount;
  57     }
  58 }
  59
  60
  61 int main(int argc, char** argv)
  62 {
  63     gLock = PR_NewLock();
  64     gCount = 0;
  65
  66     // This shouldn't compile
  67     //nsAutoLock* l1 = new nsAutoLock(theLock);
  68     //delete l1;
  69
  70     // Create a block-scoped lock. This should compile.
  71     {
  72         nsAutoLock l2(gLock);
  73     }
  74
  75     // Fork a thread to access the shared variable in a tight loop
  76     PRThread* t1 =
  77         PR_CreateThread(PR_SYSTEM_THREAD,
  78                         run,
  79                         nsnull,
  80                         PR_PRIORITY_NORMAL,
  81                         PR_GLOBAL_THREAD,
  82                         PR_JOINABLE_THREAD,
  83                         0);
  84
  85     // ...and now do the same thing ourselves
  86     run(nsnull);
  87
  88     // Wait for the background thread to finish, if necessary.
  89     PR_JoinThread(t1);
  90     return 0;
  91 }