mirror of
https://github.com/jart/cosmopolitan.git
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76 lines
3.5 KiB
C
76 lines
3.5 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2024 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/atomic.h"
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#include "libc/calls/struct/rlimit.h"
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#include "libc/calls/struct/rlimit.internal.h"
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#include "libc/cosmo.h"
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#include "libc/dce.h"
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#include "libc/intrin/cxaatexit.h"
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#include "libc/intrin/lockless.h"
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#include "libc/intrin/rlimit.h"
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#include "libc/runtime/stack.h"
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#include "libc/sysv/consts/rlim.h"
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#include "libc/sysv/consts/rlimit.h"
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struct atomic_rlimit {
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atomic_ulong cur;
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atomic_ulong max;
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atomic_uint once;
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atomic_uint gen;
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};
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static struct atomic_rlimit __rlimit_stack;
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static void __rlimit_stack_init(void) {
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struct rlimit rlim;
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if (IsWindows()) {
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rlim.rlim_cur = GetStaticStackSize();
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rlim.rlim_max = -1; // RLIM_INFINITY in consts.sh
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} else {
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sys_getrlimit(RLIMIT_STACK, &rlim);
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}
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atomic_init(&__rlimit_stack.cur, rlim.rlim_cur);
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atomic_init(&__rlimit_stack.max, rlim.rlim_max);
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}
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struct rlimit __rlimit_stack_get(void) {
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unsigned gen;
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unsigned long cur, max;
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cosmo_once(&__rlimit_stack.once, __rlimit_stack_init);
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gen = lockless_read_begin(&__rlimit_stack.gen);
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do {
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cur = atomic_load_explicit(&__rlimit_stack.cur, memory_order_acquire);
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max = atomic_load_explicit(&__rlimit_stack.max, memory_order_acquire);
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} while (!lockless_read_end(&__rlimit_stack.gen, &gen));
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return (struct rlimit){cur, max};
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}
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void __rlimit_stack_set(struct rlimit rlim) {
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unsigned gen;
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unsigned long cur, max;
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cosmo_once(&__rlimit_stack.once, __rlimit_stack_init);
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__cxa_lock();
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cur = rlim.rlim_cur;
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max = rlim.rlim_max;
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gen = lockless_write_begin(&__rlimit_stack.gen);
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atomic_store_explicit(&__rlimit_stack.cur, cur, memory_order_release);
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atomic_store_explicit(&__rlimit_stack.max, max, memory_order_release);
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lockless_write_end(&__rlimit_stack.gen, gen);
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__cxa_unlock();
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}
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