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https://github.com/jart/cosmopolitan.git
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8c645fa1ee
It's now possible to create thousands of thousands of sparse independent memory mappings, without any slowdown. The memory manager is better with tracking memory protection now, particularly on Windows in a precise way that can be restored during fork(). You now have the highest quality mem manager possible. It's even better than some OSes like XNU, where mmap() is implemented as an O(n) operation which means sadly things aren't much improved over there. With this change the llamafile HTTP server endpoint at /tokenize with a prompt of 50 tokens is now able to handle 2.6m r/sec
85 lines
4.1 KiB
C
85 lines
4.1 KiB
C
/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8 -*-│
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│ vi: set noet ft=c ts=8 sw=8 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2016 Google Inc. │
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│ │
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│ Licensed under the Apache License, Version 2.0 (the "License"); │
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│ you may not use this file except in compliance with the License. │
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│ You may obtain a copy of the License at │
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│ │
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│ http://www.apache.org/licenses/LICENSE-2.0 │
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│ │
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│ Unless required by applicable law or agreed to in writing, software │
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│ distributed under the License is distributed on an "AS IS" BASIS, │
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│ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. │
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│ See the License for the specific language governing permissions and │
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│ limitations under the License. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "third_party/nsync/mu_semaphore.h"
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#include "libc/calls/cp.internal.h"
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#include "libc/dce.h"
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#include "third_party/nsync/mu_semaphore.internal.h"
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__static_yoink("nsync_notice");
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/* Apple's ulock (part by Cosmo futexes) is an internal API, but:
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1. Unlike GCD it's cancellable, i.e. can be EINTR'd by signals
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2. We currently always use ulock anyway for joining threads */
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#define PREFER_GCD_OVER_ULOCK 1
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/* Initialize *s; the initial value is 0. */
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bool nsync_mu_semaphore_init (nsync_semaphore *s) {
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if (PREFER_GCD_OVER_ULOCK && IsXnuSilicon ()) {
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return nsync_mu_semaphore_init_gcd (s);
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} else if (IsNetbsd ()) {
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return nsync_mu_semaphore_init_sem (s);
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} else {
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return nsync_mu_semaphore_init_futex (s);
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}
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}
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/* Wait until the count of *s exceeds 0, and decrement it. If POSIX cancellations
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are currently disabled by the thread, then this function always succeeds. When
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they're enabled in MASKED mode, this function may return ECANCELED. Otherwise,
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cancellation will occur by unwinding cleanup handlers pushed to the stack. */
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errno_t nsync_mu_semaphore_p (nsync_semaphore *s) {
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errno_t err;
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BEGIN_CANCELATION_POINT;
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if (PREFER_GCD_OVER_ULOCK && IsXnuSilicon ()) {
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err = nsync_mu_semaphore_p_gcd (s);
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} else if (IsNetbsd ()) {
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err = nsync_mu_semaphore_p_sem (s);
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} else {
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err = nsync_mu_semaphore_p_futex (s);
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}
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END_CANCELATION_POINT;
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return err;
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}
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/* Like nsync_mu_semaphore_p() this waits for the count of *s to exceed 0,
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while additionally supporting a time parameter specifying at what point
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in the future ETIMEDOUT should be returned, if neither cancelation, or
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semaphore release happens. */
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errno_t nsync_mu_semaphore_p_with_deadline (nsync_semaphore *s, nsync_time abs_deadline) {
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errno_t err;
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BEGIN_CANCELATION_POINT;
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if (PREFER_GCD_OVER_ULOCK && IsXnuSilicon ()) {
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err = nsync_mu_semaphore_p_with_deadline_gcd (s, abs_deadline);
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} else if (IsNetbsd ()) {
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err = nsync_mu_semaphore_p_with_deadline_sem (s, abs_deadline);
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} else {
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err = nsync_mu_semaphore_p_with_deadline_futex (s, abs_deadline);
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}
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END_CANCELATION_POINT;
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return err;
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}
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/* Ensure that the count of *s is at least 1. */
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void nsync_mu_semaphore_v (nsync_semaphore *s) {
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if (PREFER_GCD_OVER_ULOCK && IsXnuSilicon ()) {
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return nsync_mu_semaphore_v_gcd (s);
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} else if (IsNetbsd ()) {
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return nsync_mu_semaphore_v_sem (s);
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} else {
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return nsync_mu_semaphore_v_futex (s);
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}
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}
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