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LibC: Add futex_wait() and futex_wake() helpers

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These are convinient wrappers over the most used futex operations.
futex_wait() also does some smarts for timeout and clock handling.

Use the new futex_wait() instead of a similar private helper in
LibPthread.
This commit is contained in:
Sergey Bugaev 2021-07-05 14:24:40 +03:00 • committed by Andreas Kling
parent a482a3e609
commit 8fee93d868
2 changed files with 26 additions and 15 deletions
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22
Userland/Libraries/LibC/serenity.h
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@ -7,7 +7,9 @@
#pragma once
#include <stdio.h>
#include <sys/cdefs.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
__BEGIN_DECLS
@ -70,6 +72,26 @@ int profiling_free_buffer(pid_t);
int futex(uint32_t* userspace_address, int futex_op, uint32_t value, const struct timespec* timeout, uint32_t* userspace_address2, uint32_t value3);
static ALWAYS_INLINE int futex_wait(uint32_t* userspace_address, uint32_t value, const struct timespec* abstime, int clockid)
{
int op;
if (abstime) {
// NOTE: FUTEX_WAIT takes a relative timeout, so use FUTEX_WAIT_BITSET instead!
op = FUTEX_WAIT_BITSET | FUTEX_PRIVATE_FLAG;
if (clockid == CLOCK_REALTIME || clockid == CLOCK_REALTIME_COARSE)
op |= FUTEX_CLOCK_REALTIME;
} else {
op = FUTEX_WAIT;
}
return futex(userspace_address, op, value, abstime, nullptr, FUTEX_BITSET_MATCH_ANY);
}
static ALWAYS_INLINE int futex_wake(uint32_t* userspace_address, uint32_t count)
{
return futex(userspace_address, FUTEX_WAKE, count, NULL, NULL, 0);
}
#define PURGE_ALL_VOLATILE 0x1
#define PURGE_ALL_CLEAN_INODE 0x2