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, 2007, 2008, 2009, 2011 Free Software Foundation, Inc.
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public License
  10  * as published by the Free Software Foundation; either version 3 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  21  * 02110-1301 USA
  22  */
  23
  24 \f
  25
  26 #include "libguile/__scm.h"
  27 #include "libguile/procs.h"
  28 #include "libguile/throw.h"
  29 #include "libguile/root.h"
  30 #include "libguile/iselect.h"
  31 #include "libguile/dynwind.h"
  32 #include "libguile/continuations.h"
  33
  34 #if SCM_USE_PTHREAD_THREADS
  35 #include "libguile/pthread-threads.h"
  36 #endif
  37
  38 #if SCM_USE_NULL_THREADS
  39 #include "libguile/null-threads.h"
  40 #endif
  41
  42 \f
  43
  44 /* smob tags for the thread datatypes */
  45 SCM_API scm_t_bits scm_tc16_thread;
  46 SCM_API scm_t_bits scm_tc16_mutex;
  47 SCM_API scm_t_bits scm_tc16_condvar;
  48
  49 typedef struct scm_i_thread {
  50   struct scm_i_thread *next_thread;
  51
  52   SCM handle;
  53   scm_i_pthread_t pthread;
  54
  55   SCM cleanup_handler;
  56   SCM join_queue;
  57
  58   scm_i_pthread_mutex_t admin_mutex;
  59   SCM mutexes;
  60   scm_i_pthread_mutex_t *held_mutex;
  61
  62   SCM result;
  63   int canceled;
  64   int exited;
  65
  66   /* Boolean indicating whether the thread is in guile mode.  */
  67   int guile_mode;
  68
  69   SCM sleep_object;
  70   scm_i_pthread_mutex_t *sleep_mutex;
  71   scm_i_pthread_cond_t sleep_cond;
  72   int sleep_fd, sleep_pipe[2];
  73
  74   /* Information about the Boehm-GC mark stack during the mark phase.  This
  75      is used by `scm_gc_mark ()'.  */
  76   void *current_mark_stack_ptr;
  77   void *current_mark_stack_limit;
  78
  79   /* Other thread local things.
  80    */
  81   SCM dynamic_state;
  82   SCM dynwinds;
  83
  84   /* For system asyncs.
  85    */
  86   SCM active_asyncs;            /* The thunks to be run at the next
  87                                    safe point */
  88   unsigned int block_asyncs;    /* Non-zero means that asyncs should
  89                                    not be run. */
  90   unsigned int pending_asyncs;  /* Non-zero means that asyncs might be pending.
  91                                  */
  92
  93   /* The current continuation root and the stack base for it.
  94
  95      The continuation root is an arbitrary but unique object that
  96      identifies a dynamic extent.  Continuations created during that
  97      extent can also only be invoked during it.
  98
  99      We use pairs where the car is the thread handle and the cdr links
 100      to the previous pair.  This might be used for better error
 101      messages but is not essential for identifying continuation roots.
 102
 103      The continuation base is the far end of the stack upto which it
 104      needs to be copied.
 105   */
 106   SCM continuation_root;
 107   SCM_STACKITEM *continuation_base;
 108
 109   /* For keeping track of the stack and registers. */
 110   SCM vm;
 111   SCM_STACKITEM *base;
 112   scm_i_jmp_buf regs;
 113 #ifdef __ia64__
 114   void *register_backing_store_base;
 115   scm_t_contregs *pending_rbs_continuation;
 116 #endif
 117
 118   /* Whether this thread is in a critical section. */
 119   int critical_section_level;
 120
 121 } scm_i_thread;
 122
 123 #define SCM_I_IS_THREAD(x)    SCM_SMOB_PREDICATE (scm_tc16_thread, x)
 124 #define SCM_I_THREAD_DATA(x)  ((scm_i_thread *) SCM_SMOB_DATA (x))
 125
 126 #define SCM_VALIDATE_THREAD(pos, a) \
 127   scm_assert_smob_type (scm_tc16_thread, (a))
 128 #define SCM_VALIDATE_MUTEX(pos, a) \
 129   scm_assert_smob_type (scm_tc16_mutex, (a))
 130 #define SCM_VALIDATE_CONDVAR(pos, a) \
 131   scm_assert_smob_type (scm_tc16_condvar, (a))
 132
 133 SCM_API SCM scm_spawn_thread (scm_t_catch_body body, void *body_data,
 134                               scm_t_catch_handler handler, void *handler_data);
 135
 136 SCM_API void *scm_without_guile (void *(*func)(void *), void *data);
 137 SCM_API void *scm_with_guile (void *(*func)(void *), void *data);
 138
 139 SCM_INTERNAL void scm_i_reset_fluid (size_t);
 140 SCM_INTERNAL void scm_threads_prehistory (void *);
 141 SCM_INTERNAL void scm_init_threads (void);
 142 SCM_INTERNAL void scm_init_thread_procs (void);
 143 SCM_INTERNAL void scm_init_threads_default_dynamic_state (void);
 144
 145
 146 #define SCM_THREAD_SWITCHING_CODE \
 147   do { } while (0)
 148
 149 SCM_API SCM scm_call_with_new_thread (SCM thunk, SCM handler);
 150 SCM_API SCM scm_yield (void);
 151 SCM_API SCM scm_cancel_thread (SCM t);
 152 SCM_API SCM scm_set_thread_cleanup_x (SCM thread, SCM proc);
 153 SCM_API SCM scm_thread_cleanup (SCM thread);
 154 SCM_API SCM scm_join_thread (SCM t);
 155 SCM_API SCM scm_join_thread_timed (SCM t, SCM timeout, SCM timeoutval);
 156 SCM_API SCM scm_thread_p (SCM t);
 157
 158 SCM_API SCM scm_make_mutex (void);
 159 SCM_API SCM scm_make_recursive_mutex (void);
 160 SCM_API SCM scm_make_mutex_with_flags (SCM flags);
 161 SCM_API SCM scm_lock_mutex (SCM m);
 162 SCM_API SCM scm_lock_mutex_timed (SCM m, SCM timeout, SCM owner);
 163 SCM_API void scm_dynwind_lock_mutex (SCM mutex);
 164 SCM_API SCM scm_try_mutex (SCM m);
 165 SCM_API SCM scm_unlock_mutex (SCM m);
 166 SCM_API SCM scm_unlock_mutex_timed (SCM m, SCM cond, SCM timeout);
 167 SCM_API SCM scm_mutex_p (SCM o);
 168 SCM_API SCM scm_mutex_locked_p (SCM m);
 169 SCM_API SCM scm_mutex_owner (SCM m);
 170 SCM_API SCM scm_mutex_level (SCM m);
 171
 172 SCM_API SCM scm_make_condition_variable (void);
 173 SCM_API SCM scm_wait_condition_variable (SCM cond, SCM mutex);
 174 SCM_API SCM scm_timed_wait_condition_variable (SCM cond, SCM mutex,
 175                                                SCM abstime);
 176 SCM_API SCM scm_signal_condition_variable (SCM cond);
 177 SCM_API SCM scm_broadcast_condition_variable (SCM cond);
 178 SCM_API SCM scm_condition_variable_p (SCM o);
 179
 180 SCM_API SCM scm_current_thread (void);
 181 SCM_API SCM scm_all_threads (void);
 182
 183 SCM_API int scm_c_thread_exited_p (SCM thread);
 184 SCM_API SCM scm_thread_exited_p (SCM thread);
 185
 186 SCM_API void scm_dynwind_critical_section (SCM mutex);
 187
 188 #ifdef BUILDING_LIBGUILE
 189
 190 /* Though we don't need the key for SCM_I_CURRENT_THREAD if we have TLS,
 191    we do use it for cleanup purposes.  */
 192 SCM_INTERNAL scm_i_pthread_key_t scm_i_thread_key;
 193
 194 # ifdef SCM_HAVE_THREAD_STORAGE_CLASS
 195
 196 SCM_INTERNAL SCM_THREAD_LOCAL scm_i_thread *scm_i_current_thread;
 197 #  define SCM_I_CURRENT_THREAD (scm_i_current_thread)
 198
 199 # else /* !SCM_HAVE_THREAD_STORAGE_CLASS */
 200
 201 #  define SCM_I_CURRENT_THREAD                                          \
 202     ((scm_i_thread *) scm_i_pthread_getspecific (scm_i_thread_key))
 203
 204 # endif /* !SCM_HAVE_THREAD_STORAGE_CLASS */
 205
 206 # define scm_i_dynwinds()         (SCM_I_CURRENT_THREAD->dynwinds)
 207 # define scm_i_set_dynwinds(w)    (SCM_I_CURRENT_THREAD->dynwinds = (w))
 208
 209 #endif /* BUILDING_LIBGUILE */
 210
 211
 212 SCM_INTERNAL scm_i_pthread_mutex_t scm_i_misc_mutex;
 213
 214 /* Convenience functions for working with the pthread API in guile
 215    mode.
 216 */
 217
 218 #if SCM_USE_PTHREAD_THREADS
 219 SCM_API int scm_pthread_mutex_lock (pthread_mutex_t *mutex);
 220 SCM_API void scm_dynwind_pthread_mutex_lock (pthread_mutex_t *mutex);
 221 SCM_API int scm_pthread_cond_wait (pthread_cond_t *cond,
 222                                    pthread_mutex_t *mutex);
 223 SCM_API int scm_pthread_cond_timedwait (pthread_cond_t *cond,
 224                                         pthread_mutex_t *mutex,
 225                                         const scm_t_timespec *abstime);
 226 #endif
 227
 228 /* More convenience functions.
 229  */
 230
 231 SCM_API unsigned int scm_std_sleep (unsigned int);
 232 SCM_API unsigned long scm_std_usleep (unsigned long);
 233
 234 SCM_API SCM scm_total_processor_count (void);
 235 SCM_API SCM scm_current_processor_count (void);
 236
 237 #endif  /* SCM_THREADS_H */
 238
 239 /*
 240   Local Variables:
 241   c-file-style: "gnu"
 242   End:
 243 */