testing PostQueuedCompletionStatus

output.txt

queueing  10 events: average 0.500000ms per call, dequeued
queueing  100 events: average 0.550000ms per call, dequeued
queueing  1000 events: average 0.568000ms per call, dequeued
queueing  10000 events: average 0.585400ms per call, dequeued
queueing  100000 events: average 0.568470ms per call, dequeued
queueing  1000000 events: average 0.436295ms per call, dequeued
queueing  10000000 events: average 0.444731ms per call, dequeued
queueing  100000000 events: average 0.452936ms per call^C

test.cc

include "errors.hpp"
#include "windows.hpp"
#include "time.hpp"
#include "unittest/gtest.hpp"

TEST(Delme, Post){
    HANDLE iocp = CreateIoCompletionPort(INVALID_HANDLE_VALUE, nullptr, 0, 1);
    guarantee_winerr(iocp, "A");
    for (int count = 10; ; count *= 10) {
        printf("queueing  %d events: ", count);
        fflush(stdout);
        microtime_t total = 0;
        for (int i = 0; i < count; ++i) {
            microtime_t before = current_microtime();
            BOOL res = PostQueuedCompletionStatus(iocp, 0, 0, (OVERLAPPED*)i);
            guarantee_winerr(res);
            microtime_t after = current_microtime();
            guarantee_winerr(res);
            total += after - before;
        }
        printf("average %lfms per call", total / (double)count);
        fflush(stdout);
        DWORD bytes;
        ULONG_PTR key;
        OVERLAPPED* event;
        for (int i = 0; i < count; ++i) {
            BOOL res = GetQueuedCompletionStatus(iocp, &bytes, &key, &event, INFINITE);
            guarantee_winerr(res);
            EXPECT_EQ((int)event, i);
        }
        printf(", dequeued\n");
    }
}