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#ifndef THREADS_H 
#define THREADS_H 
 
#include "machine.h" 
#include "interpret.h" 
#include "error.h" 
 
#ifdef _REENTRANT 
 
#ifdef HAVE_THREAD_H 
#define UNIX_THREADS 
#include <thread.h> 
#undef HAVE_PTHREAD_H 
#undef HAVE_THREAD_H 
#endif 
 
#ifdef HAVE_PTHREAD_H 
#define POSIX_THREADS 
#include <pthread.h> 
#undef HAVE_PTHREAD_H 
#endif 
 
 
 
extern int num_threads; 
struct object; 
extern struct object *thread_id; 
 
#define DEFINE_MUTEX(X) MUTEX_T X 
 
 
#ifdef POSIX_THREADS 
#define THREAD_T pthread_t 
#define MUTEX_T pthread_mutex_t 
#define mt_init(X) pthread_mutex_init((X),0) 
#define mt_lock(X) pthread_mutex_lock(X) 
#define mt_trylock(X) pthread_mutex_trylock(X) 
#define mt_unlock(X) pthread_mutex_unlock(X) 
#define mt_destroy(X) pthread_mutex_destroy(X) 
 
/* SIGH! No setconcurrency in posix threads. This is more or less 
 * needed to make usable multi-threaded programs on solaris machines 
 * with only one CPU. Otherwise, only systemcalls are actually 
 * threaded. 
 */ 
#define th_setconcurrency(X)  
#define th_yield() 
 
 
#define th_create(ID,fun,arg) pthread_create(ID,&pattr,fun,arg) 
#define th_exit(foo) pthread_exit(foo) 
#define th_self() pthread_self() 
 
#define COND_T pthread_cond_t 
#define co_init(X) pthread_cond_init((X), 0) 
#define co_wait(COND, MUTEX) pthread_cond_wait((COND), (MUTEX)) 
#define co_signal(X) pthread_cond_signal(X) 
#define co_broadcast(X) pthread_cond_broadcast(X) 
#define co_destroy(X) pthread_cond_destroy(X) 
#endif 
 
 
 
 
#ifdef UNIX_THREADS 
#define THREAD_T thread_t 
#define PTHREAD_MUTEX_INITIALIZER DEFAULTMUTEX 
#define MUTEX_T mutex_t 
#define mt_init(X) mutex_init((X),USYNC_THREAD,0) 
#define mt_lock(X) mutex_lock(X) 
#define mt_trylock(X) mutex_trylock(X) 
#define mt_unlock(X) mutex_unlock(X) 
#define mt_destroy(X) mutex_destroy(X) 
 
#define th_setconcurrency(X) thr_setconcurrency(X) 
 
#define th_create(ID,fun,arg) thr_create(NULL,0,fun,arg,THR_DAEMON,ID) 
#define th_exit(foo) thr_exit(foo) 
#define th_self() thr_self() 
#define th_yield() thr_yield() 
 
#define COND_T cond_t 
#define co_init(X) cond_init((X),USYNC_THREAD,0) 
#define co_wait(COND, MUTEX) cond_wait((COND), (MUTEX)) 
#define co_signal(X) cond_signal(X) 
#define co_broadcast(X) cond_broadcast(X) 
#define co_destroy(X) cond_destroy(X) 
#endif 
 
extern MUTEX_T interpreter_lock; 
 
 
struct svalue; 
struct frame; 
 
struct thread_state { 
  int swapped; 
  struct svalue *sp,*evaluator_stack; 
  struct svalue **mark_sp,**mark_stack; 
  struct frame *fp; 
  int evaluator_stack_malloced; 
  int mark_stack_malloced; 
  JMP_BUF *recoveries; 
  struct object * thread_id; 
}; 
 
#define THREADS_ALLOW() \ 
  do {\ 
     struct thread_state _tmp; \ 
     _tmp.swapped=0; \ 
     if(num_threads > 1 && !threads_disabled) { \ 
       _tmp.swapped=1; \ 
       _tmp.sp=sp; \ 
       _tmp.evaluator_stack=evaluator_stack; \ 
       _tmp.mark_sp=mark_sp; \ 
       _tmp.mark_stack=mark_stack; \ 
       _tmp.fp=fp; \ 
       _tmp.recoveries=recoveries; \ 
       _tmp.evaluator_stack_malloced=evaluator_stack_malloced; \ 
       _tmp.mark_stack_malloced=mark_stack_malloced; \ 
       _tmp.thread_id = thread_id; \ 
       mt_unlock(& interpreter_lock); \ 
       /*th_yield();*/\ 
     } 
 
#define THREADS_DISALLOW() \ 
     if(_tmp.swapped) { \ 
       mt_lock(& interpreter_lock); \ 
       sp=_tmp.sp; \ 
       evaluator_stack=_tmp.evaluator_stack; \ 
       mark_sp=_tmp.mark_sp; \ 
       mark_stack=_tmp.mark_stack; \ 
       fp=_tmp.fp; \ 
       recoveries=_tmp.recoveries; \ 
       evaluator_stack_malloced=_tmp.evaluator_stack_malloced; \ 
       mark_stack_malloced=_tmp.mark_stack_malloced; \ 
       thread_id = _tmp.thread_id; \ 
     } \ 
   } while(0) 
 
/* Prototypes begin here */ 
struct thread_starter; 
void *new_thread_func(void * data); 
void f_thread_create(INT32 args); 
void f_this_thread(INT32 args); 
void th_init(); 
struct mutex_storage; 
struct key_storage; 
void f_mutex_lock(INT32 args); 
void f_mutex_trylock(INT32 args); 
void init_mutex_obj(struct object *o); 
void exit_mutex_obj(struct object *o); 
void init_mutex_key_obj(struct object *o); 
void exit_mutex_key_obj(struct object *o); 
void f_cond_wait(INT32 args); 
void f_cond_signal(INT32 args); 
void f_cond_broadcast(INT32 args); 
void init_cond_obj(struct object *o); 
void exit_cond_obj(struct object *o); 
void th_init_programs(); 
void th_cleanup(); 
/* Prototypes end here */ 
 
#else 
#define th_setconcurrency(X) 
#define DEFINE_MUTEX(X) 
#define mt_init(X) 
#define mt_lock(X) 
#define mt_unlock(X) 
#define mt_destroy(X) 
#define THREADS_ALLOW() 
#define THREADS_DISALLOW() 
#define th_init() 
#define th_cleanup() 
#define th_init_programs() 
#endif 
 
 
extern int threads_disabled; 
#endif