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1 /* Thread and mutex controls for Objective C.
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2 Copyright (C) 1996-2020 Free Software Foundation, Inc.
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3 Contributed by Galen C. Hunt (gchunt@cs.rochester.edu)
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify
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8 it under the terms of the GNU General Public License as published by
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9 the Free Software Foundation; either version 3, or (at your option)
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10 any later version.
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11
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12 GCC is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 Under Section 7 of GPL version 3, you are granted additional
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18 permissions described in the GCC Runtime Library Exception, version
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19 3.1, as published by the Free Software Foundation.
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20
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21 You should have received a copy of the GNU General Public License and
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22 a copy of the GCC Runtime Library Exception along with this program;
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23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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24 <http://www.gnu.org/licenses/>. */
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25
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26 #ifndef __thread_INCLUDE_GNU
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27 #define __thread_INCLUDE_GNU
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28
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29 #include "objc.h"
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30
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31 #ifdef __cplusplus
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32 extern "C" {
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33 #endif /* __cplusplus */
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34
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35 /*************************************************************************
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36 * Universal static variables:
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37 */
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38 extern int __objc_thread_exit_status; /* Global exit status. */
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39
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40 /********
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41 * Thread safe implementation types and functions.
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42 */
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43
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44 /* Thread priorities */
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45 #define OBJC_THREAD_INTERACTIVE_PRIORITY 2
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46 #define OBJC_THREAD_BACKGROUND_PRIORITY 1
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47 #define OBJC_THREAD_LOW_PRIORITY 0
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48
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49 /* A thread */
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50 typedef void * objc_thread_t;
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51
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52 /* This structure represents a single mutual exclusion lock. */
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53 struct objc_mutex
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54 {
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55 volatile objc_thread_t owner; /* Id of thread that owns. */
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56 volatile int depth; /* # of acquires. */
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57 void * backend; /* Specific to backend */
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58 };
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59 typedef struct objc_mutex *objc_mutex_t;
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60
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61 /* This structure represents a single condition mutex */
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62 struct objc_condition
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63 {
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64 void * backend; /* Specific to backend */
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65 };
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66 typedef struct objc_condition *objc_condition_t;
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67
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68 /* Frontend mutex functions */
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69 objc_mutex_t objc_mutex_allocate (void);
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70 int objc_mutex_deallocate (objc_mutex_t mutex);
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71 int objc_mutex_lock (objc_mutex_t mutex);
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72 int objc_mutex_unlock (objc_mutex_t mutex);
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73 int objc_mutex_trylock (objc_mutex_t mutex);
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74
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75 /* Frontend condition mutex functions */
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76 objc_condition_t objc_condition_allocate (void);
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77 int objc_condition_deallocate (objc_condition_t condition);
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78 int objc_condition_wait (objc_condition_t condition, objc_mutex_t mutex);
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79 int objc_condition_signal (objc_condition_t condition);
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80 int objc_condition_broadcast (objc_condition_t condition);
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81
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82 /* Frontend thread functions */
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83 objc_thread_t objc_thread_detach (SEL selector, id object, id argument);
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84 void objc_thread_yield (void);
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85 int objc_thread_exit (void);
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86 int objc_thread_set_priority (int priority);
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87 int objc_thread_get_priority (void);
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88 void * objc_thread_get_data (void);
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89 int objc_thread_set_data (void *value);
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90 objc_thread_t objc_thread_id (void);
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91 void objc_thread_add (void);
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92 void objc_thread_remove (void);
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93
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94 /*
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95 Use this to set the hook function that will be called when the
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96 runtime initially becomes multi threaded.
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97 The hook function is only called once, meaning only when the
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98 2nd thread is spawned, not for each and every thread.
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99
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100 It returns the previous hook function or NULL if there is none.
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101
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102 A program outside of the runtime could set this to some function so
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103 it can be informed; for example, the GNUstep Base Library sets it
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104 so it can implement the NSBecomingMultiThreaded notification.
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105 */
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106 typedef void (*objc_thread_callback) (void);
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107 objc_thread_callback objc_set_thread_callback (objc_thread_callback func);
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108
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109 /* Backend initialization functions */
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110 int __objc_init_thread_system (void);
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111
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112 #ifdef __cplusplus
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113 }
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114 #endif /* __cplusplus */
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115
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116 #endif /* not __thread_INCLUDE_GNU */
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