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2.2M
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//
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// Concerns:
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// To test behavior and performance in case of many threads
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// and many QLocks.
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//
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// Plan:
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// Create array of data slots. Each element-slot is protected by
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// its own QLock. Create multiple threads. Each thread in the loop
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// obtains a lock for the random slot. Upon acquiring the lock for
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// the slot, the thread stores locally the slot data, manipulates
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// them with slot data, ensures the slot data is not modified by
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// other threads, restores the original slot data, and releases
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// the slot lock. Repeat above action in the loop.
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//
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// Repeat above scenario several times, incrementing the number of
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// threads by one on each iteration.
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// --------------------------------------------------------------------
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enum {
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k_MAX_SLOTS = 1000,
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k_MAX_ITER = 100000,
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k_MAX_THREADS = 20
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};
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{
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bsls::Stopwatch sw;
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sw.start();
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CaseData5 data;
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MyTask task51(testCase5_fn1, &data);
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for (int i=1; i < k_MAX_THREADS; ++i) {
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data.d_numIter = k_MAX_ITER;
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data.d_numElements = k_MAX_SLOTS;
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data.d_mutexes = 0;
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data.d_qlocks = new bslmt::QLock [k_MAX_SLOTS];
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data.d_slots = new int [k_MAX_SLOTS];
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for (int j=0; j < k_MAX_SLOTS; ++j) {
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data.d_slots[j] = 0;
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data.d_qlocks[j].initialize();
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}
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bslmt::ThreadUtil::yield();
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ASSERT(0 == task51.start(i));
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ASSERT(0 == task51.stop());
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if (veryVerbose) {
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bsl::cout << i << bsl::endl << bsl::flush;
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}
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delete [] data.d_qlocks;
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delete [] data.d_slots;
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}
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sw.stop();
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if (verbose) printMetrics(bsl::cout, "QLock", k_MAX_THREADS, sw);
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}
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{
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bsls::Stopwatch sw;
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sw.start();
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CaseData5 data;
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MyTask task52(testCase5_fn2, &data);
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for (int i=1; i < k_MAX_THREADS; ++i) {
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data.d_numIter = k_MAX_ITER;
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data.d_numElements = k_MAX_SLOTS;
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data.d_qlocks = 0;
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data.d_mutexes = new bslmt::Mutex [k_MAX_SLOTS];
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data.d_slots = new int [k_MAX_SLOTS];
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for (int j=0; j < k_MAX_SLOTS; ++j) {
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data.d_slots[j] = 0;
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}
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ASSERT(0 == task52.start(i));
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ASSERT(0 == task52.stop());
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delete [] data.d_mutexes;
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delete [] data.d_slots;
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}
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sw.stop();
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if (verbose) printMetrics(bsl::cout, "Mutex", k_MAX_THREADS, sw);
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}
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} break;
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case 4: {
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// --------------------------------------------------------------------
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// Set/Wait Flags Test
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//
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// Concerns:
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// To test internal primitives setFlags/waitOnFlag on which QLock
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// is based.
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//
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// Plan:
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