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Introduce pthread_condattr_setclock()

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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.
This commit is contained in:
Justine Tunney 2024-09-02 23:37:50 -07:00
parent 79516bf08e
commit 3c61a541bd
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GPG key ID: BE714B4575D6E328
55 changed files with 449 additions and 155 deletions
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3
third_party/lua/lunix.c vendored
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@ -110,6 +110,7 @@
#include "third_party/lua/lua.h"
#include "third_party/lua/luaconf.h"
#include "third_party/nsync/futex.internal.h"
#include "libc/sysv/consts/clock.h"
#include "tool/net/luacheck.h"
#define DNS_NAME_MAX 253
@ -2855,7 +2856,7 @@ static int LuaUnixMemoryWait(lua_State *L) {
}
BEGIN_CANCELATION_POINT;
rc = nsync_futex_wait_((atomic_int *)GetWord(L), expect,
PTHREAD_PROCESS_SHARED, deadline);
PTHREAD_PROCESS_SHARED, CLOCK_REALTIME, deadline);
END_CANCELATION_POINT;
if (rc < 0) errno = -rc, rc = -1;
return SysretInteger(L, "futex_wait", olderr, rc);