dispatch_pingpong.c [plain text]
#include <dispatch/dispatch.h>
#include <stdio.h>
#include "dispatch_test.h"
uint32_t count = 0;
const uint32_t final = 1000000;
void pingpongloop(dispatch_group_t group, dispatch_queue_t ping, dispatch_queue_t pong, size_t counter) {
if (counter < final) {
dispatch_group_async(group, pong, ^{ pingpongloop(group, pong, ping, counter+1); });
} else {
count = counter;
}
}
int main(void) {
test_start("Dispatch Ping Pong");
dispatch_queue_t ping = dispatch_queue_create("ping", NULL);
test_ptr_notnull("dispatch_queue_create(ping)", ping);
dispatch_queue_t pong = dispatch_queue_create("pong", NULL);
test_ptr_notnull("dispatch_queue_create(pong)", pong);
dispatch_group_t group = dispatch_group_create();
test_ptr_notnull("dispatch_group_create", group);
pingpongloop(group, ping, pong, 0);
dispatch_group_wait(group, DISPATCH_TIME_FOREVER);
test_long("count", count, final);
test_stop();
return 0;
}