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/* Declarations for operating system interfaces for GNU Make.
Copyright (C) 2016 Free Software Foundation, Inc.
This file is part of GNU Make.
GNU Make is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3 of the License, or (at your option) any later
version.
GNU Make 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 General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program. If not, see <http://www.gnu.org/licenses/>. */
/* This section provides OS-specific functions to support the jobserver. */
#ifdef MAKE_JOBSERVER
/* Returns 1 if the jobserver is enabled, else 0. */
unsigned int jobserver_enabled (void);
/* Called in the master instance to set up the jobserver initially. */
unsigned int jobserver_setup (int job_slots);
/* Called in a child instance to connect to the jobserver. */
unsigned int jobserver_parse_auth (const char* auth);
/* Returns an allocated buffer used to pass to child instances. */
char *jobserver_get_auth (void);
/* Clear this instance's jobserver configuration. */
void jobserver_clear (void);
/* Recover all the jobserver tokens and return the number we got. */
unsigned int jobserver_acquire_all (void);
/* Release a jobserver token. If it fails and is_fatal is 1, fatal. */
void jobserver_release (int is_fatal);
/* Notify the jobserver that a child exited. */
void jobserver_signal (void);
/* Get ready to start a non-recursive child. */
void jobserver_pre_child (int);
/* Complete starting a non-recursive child. */
void jobserver_post_child (int);
/* Set up to acquire a new token. */
void jobserver_pre_acquire (void);
/* Wait until we can acquire a jobserver token.
TIMEOUT is 1 if we have other jobs waiting for the load to go down;
in this case we won't wait forever, so we can check the load.
Returns 1 if we got a token, or 0 if we stopped waiting due to a child
exiting or a timeout. */
unsigned int jobserver_acquire (int timeout);
#else
#define jobserver_enabled() (0)
#define jobserver_setup(_slots) (0)
#define jobserver_parse_auth(_auth) (0)
#define jobserver_get_auth() (NULL)
#define jobserver_clear() (void)(0)
#define jobserver_release(_fatal) (void)(0)
#define jobserver_acquire_all() (0)
#define jobserver_signal() (void)(0)
#define jobserver_pre_child(_r) (void)(0)
#define jobserver_post_child(_r) (void)(0)
#define jobserver_pre_acquire() (void)(0)
#define jobserver_acquire(_tmout) (0)
#endif
/* Create a "bad" file descriptor for stdin when parallel jobs are run. */
#if !defined(VMD) && !defined(WINDOWS32) && !defined(_AMIGA) && !defined(__MSDOS__)
int get_bad_stdin (void);
#else
# define get_bad_stdin() (-1)
#endif
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