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88e17b57 | 1 | /* Thread and mutex controls for Objective C. |
5624e564 | 2 | Copyright (C) 1996-2015 Free Software Foundation, Inc. |
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3 | Contributed by Galen C. Hunt (gchunt@cs.rochester.edu) |
4 | ||
6c82ad25 | 5 | This file is part of GCC. |
88e17b57 | 6 | |
6c82ad25 | 7 | GCC is free software; you can redistribute it and/or modify |
88e17b57 | 8 | it under the terms of the GNU General Public License as published by |
748086b7 | 9 | the Free Software Foundation; either version 3, or (at your option) |
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10 | any later version. |
11 | ||
6c82ad25 | 12 | GCC is distributed in the hope that it will be useful, |
88e17b57 BE |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
748086b7 JJ |
17 | Under Section 7 of GPL version 3, you are granted additional |
18 | permissions described in the GCC Runtime Library Exception, version | |
19 | 3.1, as published by the Free Software Foundation. | |
88e17b57 | 20 | |
748086b7 JJ |
21 | You should have received a copy of the GNU General Public License and |
22 | a copy of the GCC Runtime Library Exception along with this program; | |
23 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
24 | <http://www.gnu.org/licenses/>. */ | |
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25 | |
26 | #ifndef __thread_INCLUDE_GNU | |
27 | #define __thread_INCLUDE_GNU | |
28 | ||
cf223603 | 29 | #include "objc.h" |
88e17b57 | 30 | |
6f0aa5e1 AP |
31 | #ifdef __cplusplus |
32 | extern "C" { | |
33 | #endif /* __cplusplus */ | |
34 | ||
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35 | /************************************************************************* |
36 | * Universal static variables: | |
37 | */ | |
38 | extern int __objc_thread_exit_status; /* Global exit status. */ | |
39 | ||
40 | /******** | |
41 | * Thread safe implementation types and functions. | |
42 | */ | |
43 | ||
44 | /* Thread priorities */ | |
45 | #define OBJC_THREAD_INTERACTIVE_PRIORITY 2 | |
46 | #define OBJC_THREAD_BACKGROUND_PRIORITY 1 | |
47 | #define OBJC_THREAD_LOW_PRIORITY 0 | |
48 | ||
49 | /* A thread */ | |
50 | typedef void * objc_thread_t; | |
51 | ||
52 | /* This structure represents a single mutual exclusion lock. */ | |
53 | struct objc_mutex | |
54 | { | |
55 | volatile objc_thread_t owner; /* Id of thread that owns. */ | |
56 | volatile int depth; /* # of acquires. */ | |
57 | void * backend; /* Specific to backend */ | |
58 | }; | |
59 | typedef struct objc_mutex *objc_mutex_t; | |
60 | ||
61 | /* This structure represents a single condition mutex */ | |
62 | struct objc_condition | |
63 | { | |
64 | void * backend; /* Specific to backend */ | |
65 | }; | |
66 | typedef struct objc_condition *objc_condition_t; | |
67 | ||
68 | /* Frontend mutex functions */ | |
40165636 RB |
69 | objc_mutex_t objc_mutex_allocate (void); |
70 | int objc_mutex_deallocate (objc_mutex_t mutex); | |
71 | int objc_mutex_lock (objc_mutex_t mutex); | |
72 | int objc_mutex_unlock (objc_mutex_t mutex); | |
73 | int objc_mutex_trylock (objc_mutex_t mutex); | |
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74 | |
75 | /* Frontend condition mutex functions */ | |
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76 | objc_condition_t objc_condition_allocate (void); |
77 | int objc_condition_deallocate (objc_condition_t condition); | |
78 | int objc_condition_wait (objc_condition_t condition, objc_mutex_t mutex); | |
79 | int objc_condition_signal (objc_condition_t condition); | |
80 | int objc_condition_broadcast (objc_condition_t condition); | |
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81 | |
82 | /* Frontend thread functions */ | |
40165636 RB |
83 | objc_thread_t objc_thread_detach (SEL selector, id object, id argument); |
84 | void objc_thread_yield (void); | |
85 | int objc_thread_exit (void); | |
86 | int objc_thread_set_priority (int priority); | |
87 | int objc_thread_get_priority (void); | |
88 | void * objc_thread_get_data (void); | |
89 | int objc_thread_set_data (void *value); | |
90 | objc_thread_t objc_thread_id (void); | |
91 | void objc_thread_add (void); | |
92 | void objc_thread_remove (void); | |
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93 | |
94 | /* | |
95 | Use this to set the hook function that will be called when the | |
96 | runtime initially becomes multi threaded. | |
97 | The hook function is only called once, meaning only when the | |
98 | 2nd thread is spawned, not for each and every thread. | |
99 | ||
100 | It returns the previous hook function or NULL if there is none. | |
101 | ||
102 | A program outside of the runtime could set this to some function so | |
103 | it can be informed; for example, the GNUstep Base Library sets it | |
104 | so it can implement the NSBecomingMultiThreaded notification. | |
105 | */ | |
40165636 RB |
106 | typedef void (*objc_thread_callback) (void); |
107 | objc_thread_callback objc_set_thread_callback (objc_thread_callback func); | |
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108 | |
109 | /* Backend initialization functions */ | |
40165636 | 110 | int __objc_init_thread_system (void); |
88e17b57 | 111 | |
6f0aa5e1 AP |
112 | #ifdef __cplusplus |
113 | } | |
114 | #endif /* __cplusplus */ | |
115 | ||
88e17b57 | 116 | #endif /* not __thread_INCLUDE_GNU */ |