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https://github.com/jart/cosmopolitan.git
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45a7435788
* Exponential back-off * Removed "native" specifier * Abstract away Futex for cthread * Complete setup for TLS (including main thread)
50 lines
2.7 KiB
C
50 lines
2.7 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/sysv/consts/futex.h"
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#include "libc/sysv/consts/nr.h"
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#include "libc/thread/wait.h"
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int cthread_memory_wait32(uint32_t* addr, uint32_t val,
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const struct timespec* timeout) {
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if (__NR_futex != 0xfff) {
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int flags = FUTEX_WAIT;
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int rc;
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register struct timespec* timeout_ asm("r10") = timeout;
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asm volatile("syscall"
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: "=a"(rc)
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: "0"(__NR_futex), "D"(addr), "S"(flags), "d"(val),
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"r"(timeout_)
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: "rcx", "r11", "cc", "memory");
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return rc;
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}
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return -1;
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}
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int cthread_memory_wake32(uint32_t* addr, int n) {
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if (__NR_futex != 0xfff) {
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int flags = FUTEX_WAKE;
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int rc;
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asm volatile("syscall"
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: "=a"(rc)
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: "0"(__NR_futex), "D"(addr), "S"(flags), "d"(n)
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: "rcx", "r11", "cc", "memory");
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return rc;
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}
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return -1;
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}
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