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21 #include "config/config.h"
28 #include <dispatch/dispatch.h>
30 #include "dispatch_test.h"
33 // There were several bugs related to sign extension / integer overflow that
34 // were encountered during development. Create a timer whose interval has the
35 // 63rd bit of the word set to verify that it behaves correctly.
37 // The expected side-effect of integer overflow would be for the timer to
38 // fire immediately since its interval has "elapsed." If the timer does not
39 // fire within 1s we can assume the arithmetic was performed correctly.
45 test_start("Dispatch Source Timer, bit 63");
47 //uint64_t interval = 0xffffffffffffffffull;
48 uint64_t interval = 0x8000000000000001ull;
50 dispatch_queue_t mainq = dispatch_get_main_queue();
53 struct timeval start_time;
55 gettimeofday(&start_time, NULL);
58 ds = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, mainq);
60 dispatch_source_set_event_handler(ds, ^{
64 dispatch_source_set_timer(ds, DISPATCH_TIME_NOW, interval, 0);
67 dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 1*NSEC_PER_SEC),
68 dispatch_get_main_queue(), ^{