mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
49 lines
2.9 KiB
C
49 lines
2.9 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2022 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/dce.h"
|
|
#include "libc/errno.h"
|
|
#include "libc/thread/thread.h"
|
|
|
|
/**
|
|
* Sets contention scope attribute.
|
|
*
|
|
* @param contentionscope may be one of:
|
|
* - `PTHREAD_SCOPE_SYSTEM` to fight the system for resources
|
|
* - `PTHREAD_SCOPE_PROCESS` to fight familiar threads for resources
|
|
* @return 0 on success, or errno on error
|
|
* @raise ENOTSUP if `contentionscope` isn't supported on host OS
|
|
* @raise EINVAL if `contentionscope` was invalid
|
|
*/
|
|
errno_t pthread_attr_setscope(pthread_attr_t *attr, int contentionscope) {
|
|
switch (contentionscope) {
|
|
case PTHREAD_SCOPE_SYSTEM:
|
|
attr->__contentionscope = contentionscope;
|
|
return 0;
|
|
case PTHREAD_SCOPE_PROCESS:
|
|
// Linux almost certainly doesn't support thread scoping
|
|
// FreeBSD has THR_SYSTEM_SCOPE but it's not implemented
|
|
// OpenBSD pthreads claims support but really ignores it
|
|
// NetBSD pthreads claims support, but really ignores it
|
|
// XNU sources appear to make no mention of thread scope
|
|
// WIN32 documentation says nothing about thread scoping
|
|
return ENOTSUP;
|
|
default:
|
|
return EINVAL;
|
|
}
|
|
}
|