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/* posix-thread.c - GPGRT thread functions for POSIX systems
Copyright (C) 2014 g10 Code GmbH
This file is part of libgpg-error.
libgpg-error is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License
as published by the Free Software Foundation; either version 2.1 of
the License, or (at your option) any later version.
libgpg-error is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this program; if not, see <https://www.gnu.org/licenses/>.
*/
#if HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_W32_SYSTEM
# error This module may not be build for Windows.
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h> /* Get posix option macros. */
#if USE_POSIX_THREADS
# ifdef _POSIX_PRIORITY_SCHEDULING
# include <sched.h>
# endif
#elif USE_SOLARIS_THREADS
# include <thread.h>
#endif
#include "gpg-error.h"
#include "thread.h"
/*
* Functions called before and after blocking syscalls.
* gpgrt_set_syscall_clamp is used to set them.
*/
static void (*pre_syscall_func)(void);
static void (*post_syscall_func)(void);
/* Helper to set the clamp functions. This is called as a helper from
* _gpgrt_set_syscall_clamp to keep the function pointers local. */
void
_gpgrt_thread_set_syscall_clamp (void (*pre)(void), void (*post)(void))
{
pre_syscall_func = pre;
post_syscall_func = post;
}
gpg_err_code_t
_gpgrt_yield (void)
{
#if USE_POSIX_THREADS
# ifdef _POSIX_PRIORITY_SCHEDULING
if (pre_syscall_func)
pre_syscall_func ();
sched_yield ();
if (post_syscall_func)
post_syscall_func ();
# else
return GPG_ERR_NOT_SUPPORTED;
# endif
#elif USE_SOLARIS_THREADS
if (pre_syscall_func)
pre_syscall_func ();
thr_yield ();
if (post_syscall_func)
post_syscall_func ();
#else
return GPG_ERR_NOT_SUPPORTED;
#endif
return 0;
}