| 1 | /* Declarations for operating system interfaces for GNU Make.
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| 2 | Copyright (C) 2016 Free Software Foundation, Inc.
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| 3 | This file is part of GNU Make.
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| 4 |
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| 5 | GNU Make is free software; you can redistribute it and/or modify it under the
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| 6 | terms of the GNU General Public License as published by the Free Software
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| 7 | Foundation; either version 3 of the License, or (at your option) any later
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| 8 | version.
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| 9 |
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| 10 | GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
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| 11 | WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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| 12 | A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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| 13 |
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| 14 | You should have received a copy of the GNU General Public License along with
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| 15 | this program. If not, see <http://www.gnu.org/licenses/>. */
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| 16 |
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| 17 |
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| 18 | /* This section provides OS-specific functions to support the jobserver. */
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| 19 |
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| 20 | #ifdef MAKE_JOBSERVER
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| 21 |
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| 22 | /* Returns 1 if the jobserver is enabled, else 0. */
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| 23 | unsigned int jobserver_enabled (void);
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| 24 |
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| 25 | /* Called in the master instance to set up the jobserver initially. */
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| 26 | unsigned int jobserver_setup (int job_slots);
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| 27 |
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| 28 | /* Called in a child instance to connect to the jobserver. */
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| 29 | unsigned int jobserver_parse_auth (const char* auth);
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| 30 |
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| 31 | /* Returns an allocated buffer used to pass to child instances. */
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| 32 | char *jobserver_get_auth (void);
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| 33 |
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| 34 | /* Clear this instance's jobserver configuration. */
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| 35 | void jobserver_clear (void);
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| 36 |
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| 37 | /* Recover all the jobserver tokens and return the number we got. */
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| 38 | unsigned int jobserver_acquire_all (void);
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| 39 |
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| 40 | /* Release a jobserver token. If it fails and is_fatal is 1, fatal. */
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| 41 | void jobserver_release (int is_fatal);
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| 42 |
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| 43 | /* Notify the jobserver that a child exited. */
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| 44 | void jobserver_signal (void);
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| 45 |
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| 46 | /* Get ready to start a non-recursive child. */
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| 47 | void jobserver_pre_child (int);
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| 48 |
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| 49 | /* Complete starting a non-recursive child. */
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| 50 | void jobserver_post_child (int);
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| 51 |
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| 52 | /* Set up to acquire a new token. */
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| 53 | void jobserver_pre_acquire (void);
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| 54 |
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| 55 | /* Wait until we can acquire a jobserver token.
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| 56 | TIMEOUT is 1 if we have other jobs waiting for the load to go down;
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| 57 | in this case we won't wait forever, so we can check the load.
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| 58 | Returns 1 if we got a token, or 0 if we stopped waiting due to a child
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| 59 | exiting or a timeout. */
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| 60 | unsigned int jobserver_acquire (int timeout);
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| 61 |
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| 62 | #else
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| 63 |
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| 64 | #define jobserver_enabled() (0)
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| 65 | #define jobserver_setup(_slots) (0)
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| 66 | #define jobserver_parse_auth(_auth) (0)
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| 67 | #define jobserver_get_auth() (NULL)
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| 68 | #define jobserver_clear() (void)(0)
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| 69 | #define jobserver_release(_fatal) (void)(0)
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| 70 | #define jobserver_acquire_all() (0)
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| 71 | #define jobserver_signal() (void)(0)
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| 72 | #define jobserver_pre_child(_r) (void)(0)
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| 73 | #define jobserver_post_child(_r) (void)(0)
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| 74 | #define jobserver_pre_acquire() (void)(0)
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| 75 | #define jobserver_acquire(_tmout) (0)
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| 76 |
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| 77 | #endif
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| 78 |
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| 79 | /* Create a "bad" file descriptor for stdin when parallel jobs are run. */
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| 80 | #if !defined(VMD) && !defined(WINDOWS32) && !defined(_AMIGA) && !defined(__MSDOS__)
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| 81 | int get_bad_stdin (void);
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| 82 | #else
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| 83 | # define get_bad_stdin() (-1)
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| 84 | #endif
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