libguile/threads.h

   1 /* classes: h_files */
   2
   3 #ifndef SCM_THREADS_H
   4 #define SCM_THREADS_H
   5
   6 /* Copyright (C) 1996, 1997, 1998, 2000, 2001, 2002, 2003, 2004, 2006,
   7  *   2007, 2008, 2009, 2011, 2012, 2013 Free Software Foundation, Inc.
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public License
  11  * as published by the Free Software Foundation; either version 3 of
  12  * the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  22  * 02110-1301 USA
  23  */
  24
  25 \f
  26
  27 #include "libguile/__scm.h"
  28 #include "libguile/procs.h"
  29 #include "libguile/throw.h"
  30 #include "libguile/root.h"
  31 #include "libguile/dynstack.h"
  32 #include "libguile/iselect.h"
  33 #include "libguile/continuations.h"
  34
  35 #if SCM_USE_PTHREAD_THREADS
  36 #include "libguile/pthread-threads.h"
  37 #endif
  38
  39 #if SCM_USE_NULL_THREADS
  40 #include "libguile/null-threads.h"
  41 #endif
  42
  43 \f
  44
  45 /* smob tags for the thread datatypes */
  46 SCM_API scm_t_bits scm_tc16_thread;
  47 SCM_API scm_t_bits scm_tc16_mutex;
  48 SCM_API scm_t_bits scm_tc16_condvar;
  49
  50 typedef struct scm_i_thread {
  51   struct scm_i_thread *next_thread;
  52
  53   SCM handle;
  54   scm_i_pthread_t pthread;
  55
  56   SCM cleanup_handler;
  57   SCM join_queue;
  58
  59   scm_i_pthread_mutex_t admin_mutex;
  60   SCM mutexes;
  61   scm_i_pthread_mutex_t *held_mutex;
  62
  63   SCM result;
  64   int canceled;
  65   int exited;
  66
  67   /* Boolean indicating whether the thread is in guile mode.  */
  68   int guile_mode;
  69
  70   SCM sleep_object;
  71   scm_i_pthread_mutex_t *sleep_mutex;
  72   scm_i_pthread_cond_t sleep_cond;
  73   int sleep_fd, sleep_pipe[2];
  74
  75   /* Other thread local things.
  76    */
  77   SCM dynamic_state;
  78
  79   /* The dynamic stack.  */
  80   scm_t_dynstack dynstack;
  81
  82   /* For system asyncs.
  83    */
  84   SCM active_asyncs;            /* The thunks to be run at the next
  85                                    safe point */
  86   unsigned int block_asyncs;    /* Non-zero means that asyncs should
  87                                    not be run. */
  88   unsigned int pending_asyncs;  /* Non-zero means that asyncs might be pending.
  89                                  */
  90
  91   /* The current continuation root and the stack base for it.
  92
  93      The continuation root is an arbitrary but unique object that
  94      identifies a dynamic extent.  Continuations created during that
  95      extent can also only be invoked during it.
  96
  97      We use pairs where the car is the thread handle and the cdr links
  98      to the previous pair.  This might be used for better error
  99      messages but is not essential for identifying continuation roots.
 100
 101      The continuation base is the far end of the stack upto which it
 102      needs to be copied.
 103   */
 104   SCM continuation_root;
 105   SCM_STACKITEM *continuation_base;
 106
 107   /* For keeping track of the stack and registers. */
 108   struct scm_vm *vp;
 109   SCM_STACKITEM *base;
 110   scm_i_jmp_buf regs;
 111 #ifdef __ia64__
 112   void *register_backing_store_base;
 113   scm_t_contregs *pending_rbs_continuation;
 114 #endif
 115
 116   /* Whether this thread is in a critical section. */
 117   int critical_section_level;
 118
 119 } scm_i_thread;
 120
 121 #define SCM_I_IS_THREAD(x)    SCM_SMOB_PREDICATE (scm_tc16_thread, x)
 122 #define SCM_I_THREAD_DATA(x)  ((scm_i_thread *) SCM_SMOB_DATA (x))
 123
 124 #define SCM_VALIDATE_THREAD(pos, a) \
 125   scm_assert_smob_type (scm_tc16_thread, (a))
 126 #define SCM_VALIDATE_MUTEX(pos, a) \
 127   scm_assert_smob_type (scm_tc16_mutex, (a))
 128 #define SCM_VALIDATE_CONDVAR(pos, a) \
 129   scm_assert_smob_type (scm_tc16_condvar, (a))
 130
 131 SCM_API SCM scm_spawn_thread (scm_t_catch_body body, void *body_data,
 132                               scm_t_catch_handler handler, void *handler_data);
 133
 134 SCM_API void *scm_without_guile (void *(*func)(void *), void *data);
 135 SCM_API void *scm_with_guile (void *(*func)(void *), void *data);
 136
 137 SCM_INTERNAL void scm_i_reset_fluid (size_t);
 138 SCM_INTERNAL void scm_threads_prehistory (void *);
 139 SCM_INTERNAL void scm_init_threads (void);
 140 SCM_INTERNAL void scm_init_thread_procs (void);
 141 SCM_INTERNAL void scm_init_threads_default_dynamic_state (void);
 142
 143 SCM_INTERNAL void scm_i_dynwind_pthread_mutex_lock_block_asyncs (scm_i_pthread_mutex_t *mutex);
 144
 145 SCM_API SCM scm_call_with_new_thread (SCM thunk, SCM handler);
 146 SCM_API SCM scm_yield (void);
 147 SCM_API SCM scm_cancel_thread (SCM t);
 148 SCM_API SCM scm_set_thread_cleanup_x (SCM thread, SCM proc);
 149 SCM_API SCM scm_thread_cleanup (SCM thread);
 150 SCM_API SCM scm_join_thread (SCM t);
 151 SCM_API SCM scm_join_thread_timed (SCM t, SCM timeout, SCM timeoutval);
 152 SCM_API SCM scm_thread_p (SCM t);
 153
 154 SCM_API SCM scm_make_mutex (void);
 155 SCM_API SCM scm_make_recursive_mutex (void);
 156 SCM_API SCM scm_make_mutex_with_flags (SCM flags);
 157 SCM_API SCM scm_lock_mutex (SCM m);
 158 SCM_API SCM scm_lock_mutex_timed (SCM m, SCM timeout, SCM owner);
 159 SCM_API void scm_dynwind_lock_mutex (SCM mutex);
 160 SCM_API SCM scm_try_mutex (SCM m);
 161 SCM_API SCM scm_unlock_mutex (SCM m);
 162 SCM_API SCM scm_unlock_mutex_timed (SCM m, SCM cond, SCM timeout);
 163 SCM_API SCM scm_mutex_p (SCM o);
 164 SCM_API SCM scm_mutex_locked_p (SCM m);
 165 SCM_API SCM scm_mutex_owner (SCM m);
 166 SCM_API SCM scm_mutex_level (SCM m);
 167
 168 SCM_API SCM scm_make_condition_variable (void);
 169 SCM_API SCM scm_wait_condition_variable (SCM cond, SCM mutex);
 170 SCM_API SCM scm_timed_wait_condition_variable (SCM cond, SCM mutex,
 171                                                SCM abstime);
 172 SCM_API SCM scm_signal_condition_variable (SCM cond);
 173 SCM_API SCM scm_broadcast_condition_variable (SCM cond);
 174 SCM_API SCM scm_condition_variable_p (SCM o);
 175
 176 SCM_API SCM scm_current_thread (void);
 177 SCM_API SCM scm_all_threads (void);
 178
 179 SCM_API int scm_c_thread_exited_p (SCM thread);
 180 SCM_API SCM scm_thread_exited_p (SCM thread);
 181
 182 SCM_API void scm_dynwind_critical_section (SCM mutex);
 183
 184 #ifdef BUILDING_LIBGUILE
 185
 186 /* Though we don't need the key for SCM_I_CURRENT_THREAD if we have TLS,
 187    we do use it for cleanup purposes.  */
 188 SCM_INTERNAL scm_i_pthread_key_t scm_i_thread_key;
 189
 190 # ifdef SCM_HAVE_THREAD_STORAGE_CLASS
 191
 192 SCM_INTERNAL SCM_THREAD_LOCAL scm_i_thread *scm_i_current_thread;
 193 #  define SCM_I_CURRENT_THREAD (scm_i_current_thread)
 194
 195 # else /* !SCM_HAVE_THREAD_STORAGE_CLASS */
 196
 197 #  define SCM_I_CURRENT_THREAD                                          \
 198     ((scm_i_thread *) scm_i_pthread_getspecific (scm_i_thread_key))
 199
 200 # endif /* !SCM_HAVE_THREAD_STORAGE_CLASS */
 201
 202 #endif /* BUILDING_LIBGUILE */
 203
 204 SCM_INTERNAL scm_i_pthread_mutex_t scm_i_misc_mutex;
 205
 206 /* Convenience functions for working with the pthread API in guile
 207    mode.
 208 */
 209
 210 #if SCM_USE_PTHREAD_THREADS
 211 SCM_API int scm_pthread_mutex_lock (pthread_mutex_t *mutex);
 212 SCM_API void scm_dynwind_pthread_mutex_lock (pthread_mutex_t *mutex);
 213 SCM_API int scm_pthread_cond_wait (pthread_cond_t *cond,
 214                                    pthread_mutex_t *mutex);
 215 SCM_API int scm_pthread_cond_timedwait (pthread_cond_t *cond,
 216                                         pthread_mutex_t *mutex,
 217                                         const scm_t_timespec *abstime);
 218 #endif
 219
 220 /* More convenience functions.
 221  */
 222
 223 SCM_API unsigned int scm_std_sleep (unsigned int);
 224 SCM_API unsigned long scm_std_usleep (unsigned long);
 225
 226 SCM_API SCM scm_total_processor_count (void);
 227 SCM_API SCM scm_current_processor_count (void);
 228
 229 #endif  /* SCM_THREADS_H */
 230
 231 /*
 232   Local Variables:
 233   c-file-style: "gnu"
 234   End:
 235 */