1 /* Thread and mutex controls for Objective C. 2 Copyright (C) 1996, 1997, 2002 Free Software Foundation, Inc. 3 Contributed by Galen C. Hunt (gchunt@cs.rochester.edu) 4 5 This file is part of GCC. 6 7 GCC is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 2, or (at your option) 10 any later version. 11 12 GCC is distributed in the hope that it will be useful, 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 17 GCC is free software; you can redistribute it and/or modify it under the 18 terms of the GNU General Public License as published by the Free Software 19 Foundation; either version 2, or (at your option) any later version. 20 21 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 22 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 23 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more 24 details. 25 26 You should have received a copy of the GNU General Public License along with 27 GCC; see the file COPYING. If not, write to the Free Software 28 Foundation, 59 Temple Place - Suite 330, 29 Boston, MA 02111-1307, USA. */ 30 31 /* As a special exception, if you link this library with files 32 compiled with GCC to produce an executable, this does not cause 33 the resulting executable to be covered by the GNU General Public License. 34 This exception does not however invalidate any other reasons why 35 the executable file might be covered by the GNU General Public License. */ 36 37 38 #ifndef __thread_INCLUDE_GNU 39 #define __thread_INCLUDE_GNU 40 41 #include "objc/objc.h" 42 43 /************************************************************************* 44 * Universal static variables: 45 */ 46 extern int __objc_thread_exit_status; /* Global exit status. */ 47 48 /******** 49 * Thread safe implementation types and functions. 50 */ 51 52 /* Thread priorities */ 53 #define OBJC_THREAD_INTERACTIVE_PRIORITY 2 54 #define OBJC_THREAD_BACKGROUND_PRIORITY 1 55 #define OBJC_THREAD_LOW_PRIORITY 0 56 57 /* A thread */ 58 typedef void * objc_thread_t; 59 60 /* This structure represents a single mutual exclusion lock. */ 61 struct objc_mutex 62 { 63 volatile objc_thread_t owner; /* Id of thread that owns. */ 64 volatile int depth; /* # of acquires. */ 65 void * backend; /* Specific to backend */ 66 }; 67 typedef struct objc_mutex *objc_mutex_t; 68 69 /* This structure represents a single condition mutex */ 70 struct objc_condition 71 { 72 void * backend; /* Specific to backend */ 73 }; 74 typedef struct objc_condition *objc_condition_t; 75 76 /* Frontend mutex functions */ 77 objc_mutex_t objc_mutex_allocate (void); 78 int objc_mutex_deallocate (objc_mutex_t mutex); 79 int objc_mutex_lock (objc_mutex_t mutex); 80 int objc_mutex_unlock (objc_mutex_t mutex); 81 int objc_mutex_trylock (objc_mutex_t mutex); 82 83 /* Frontend condition mutex functions */ 84 objc_condition_t objc_condition_allocate (void); 85 int objc_condition_deallocate (objc_condition_t condition); 86 int objc_condition_wait (objc_condition_t condition, objc_mutex_t mutex); 87 int objc_condition_signal (objc_condition_t condition); 88 int objc_condition_broadcast (objc_condition_t condition); 89 90 /* Frontend thread functions */ 91 objc_thread_t objc_thread_detach (SEL selector, id object, id argument); 92 void objc_thread_yield (void); 93 int objc_thread_exit (void); 94 int objc_thread_set_priority (int priority); 95 int objc_thread_get_priority (void); 96 void * objc_thread_get_data (void); 97 int objc_thread_set_data (void *value); 98 objc_thread_t objc_thread_id (void); 99 void objc_thread_add (void); 100 void objc_thread_remove (void); 101 102 /* 103 Use this to set the hook function that will be called when the 104 runtime initially becomes multi threaded. 105 The hook function is only called once, meaning only when the 106 2nd thread is spawned, not for each and every thread. 107 108 It returns the previous hook function or NULL if there is none. 109 110 A program outside of the runtime could set this to some function so 111 it can be informed; for example, the GNUstep Base Library sets it 112 so it can implement the NSBecomingMultiThreaded notification. 113 */ 114 typedef void (*objc_thread_callback) (void); 115 objc_thread_callback objc_set_thread_callback (objc_thread_callback func); 116 117 /* Backend initialization functions */ 118 int __objc_init_thread_system (void); 119 int __objc_fini_thread_system (void); 120 121 /* Backend mutex functions */ 122 int __objc_mutex_allocate (objc_mutex_t mutex); 123 int __objc_mutex_deallocate (objc_mutex_t mutex); 124 int __objc_mutex_lock (objc_mutex_t mutex); 125 int __objc_mutex_trylock (objc_mutex_t mutex); 126 int __objc_mutex_unlock (objc_mutex_t mutex); 127 128 /* Backend condition mutex functions */ 129 int __objc_condition_allocate (objc_condition_t condition); 130 int __objc_condition_deallocate (objc_condition_t condition); 131 int __objc_condition_wait (objc_condition_t condition, objc_mutex_t mutex); 132 int __objc_condition_broadcast (objc_condition_t condition); 133 int __objc_condition_signal (objc_condition_t condition); 134 135 /* Backend thread functions */ 136 objc_thread_t __objc_thread_detach (void (*func) (void *arg), void *arg); 137 int __objc_thread_set_priority (int priority); 138 int __objc_thread_get_priority (void); 139 void __objc_thread_yield (void); 140 int __objc_thread_exit (void); 141 objc_thread_t __objc_thread_id (void); 142 int __objc_thread_set_data (void *value); 143 void * __objc_thread_get_data (void); 144 145 #endif /* not __thread_INCLUDE_GNU */ 146