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This is one of the few POSIX APIs that was missing. It lets you choose a monotonic clock for your condition variables. This might improve perf on some platforms. It might also grant more flexibility with NTP configs. I know Qt is one project that believes it needs this. To introduce this, I needed to change some the *NSYNC APIs, to support passing a clock param. There's also new benchmarks, demonstrating Cosmopolitan's supremacy over many libc implementations when it comes to mutex performance. Cygwin has an alarmingly bad pthread_mutex_t implementation. It is so bad that they would have been significantly better off if they'd used naive spinlocks.
2 lines
103 B
ArmAsm
2 lines
103 B
ArmAsm
#include "libc/sysv/consts/syscon.internal.h"
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.syscon clock,CLOCK_MONOTONIC_RAW_APPROX,4,4,5,5,4,3,3,1
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