On MacOS & iOS, __thread variable is 35% faster than using pthread_getspecific.
getSpecific cost: 0.000649
getTLS cost: 0.000423
- (void)test {
double t1 = CFAbsoluteTimeGetCurrent();
for (int i = 0; i < 100000; i++) {
[self getSpecific];
}
double t2 = CFAbsoluteTimeGetCurrent();
printf("getSpecific cost: %f\n", t2 - t1);
double t3 = CFAbsoluteTimeGetCurrent();
for (int i = 0; i < 100000; i++) {
[self getTLS];
}
double t4 = CFAbsoluteTimeGetCurrent();
printf("getTLS cost: %f\n", t4 - t3);
}
- (int)getSpecific {
int * value = pthread_getspecific(tlsKey);
return *value;
}
- (int)getTLS {
return *tlv_v5;
}_______________________________________________
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