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#ifndef THREADS_H 
#define THREADS_H 
 
#include "machine.h" 
#include "interpret.h" 
#include "object.h" 
#include "error.h" 
#ifdef HAVE_SYS_TYPES_H 
/* Needed for pthread_t on OSF/1 */ 
#include <sys/types.h> 
#endif /* HAVE_SYS_TYPES_H */ 
#ifdef _REENTRANT 
 
/* 
 * Decide which type of threads to use 
 * 
 * UNIX_THREADS : Unix international threads 
 * POSIX_THREADS : POSIX standard threads 
 * SGI_SPROC_THREADS : SGI sproc() based threads 
 */ 
 
#ifdef _UNIX_THREADS 
#ifdef HAVE_THREAD_H 
#define UNIX_THREADS 
#include <thread.h> 
#undef HAVE_PTHREAD_H 
#undef HAVE_THREAD_H 
#endif 
#endif /* _UNIX_THREADS */ 
 
#ifdef _MIT_POSIX_THREADS 
#ifdef HAVE_PTHREAD_H 
#define POSIX_THREADS 
#include <pthread.h> 
#undef HAVE_PTHREAD_H 
#endif 
#endif /* _MIT_POSIX_THREADS */ 
 
#ifdef _SGI_SPROC_THREADS 
/* Not supported yet */ 
#undef SGI_SPROC_THREADS 
#undef HAVE_SPROC 
#endif /* _SGI_SPROC_THREADS */ 
 
 
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)  
#ifdef HAVE_PTHREAD_YIELD 
#define th_yield()    pthread_yield() 
#else 
#define th_yield() 
#endif /* HAVE_PTHREAD_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() 
 
#ifdef HAVE_PTHREAD_COND_INIT 
#define COND_T pthread_cond_t 
 
#ifdef HAVE_PTHREAD_CONDATTR_DEFAULT 
#define co_init(X) pthread_cond_init((X), pthread_condattr_default) 
#else 
#define co_init(X) pthread_cond_init((X), 0) 
#endif /* HAVE_PTHREAD_CONDATTR_DEFAULT */ 
 
#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) 
#else 
#error No way to make cond-vars 
#endif /* HAVE_PTHREAD_COND_INIT */ 
 
#endif /* POSIX_THREADS */ 
 
 
 
 
#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|THR_DETACHED,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 /* UNIX_THREADS */ 
 
#ifdef SGI_SPROC_THREADS 
 
/* 
 * Not fully supported yet 
 */ 
#define THREAD_T      int 
 
#define MUTEX_T               ulock_t 
#define mt_init(X)    (usinitlock(((*X) = usnewlock(/*********/)))) 
#define mt_lock(X)    ussetlock(*X) 
#define mt_unlock(X)  usunsetlock(*X) 
#define mt_destroy(X) usfreelock((*X), /*******/) 
 
#define th_setconcurrency(X)  /*******/ 
 
#define PIKE_SPROC_FLAGS      (PR_SADDR|PR_SFDS|PR_SDIR|PS_SETEXITSIG) 
#define th_create(ID, fun, arg)       (((*(ID)) = sproc(fun, PIKE_SPROC_FLAGS, arg)) == -1) 
#define th_exit(X)    exit(X) 
#define th_self()     getpid() 
#define th_yield()    sginap(0) 
 
/* 
 * No cond_vars yet 
 */ 
 
#endif /* SGI_SPROC_THREADS */ 
 
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 to get a debug-trace of some of the threads operations. */ 
/* #define VERBOSE_THREADS_DEBUG */ 
 
#ifndef VERBOSE_THREADS_DEBUG 
#define THREADS_FPRINTF(X) 
#else 
#define THREADS_FPRINTF(X)    fprintf X 
#endif /* VERBOSE_THREADS_DEBUG */ 
 
#define SWAP_OUT_THREAD(_tmp) do { \ 
       (_tmp)->swapped=1; \ 
       (_tmp)->evaluator_stack=evaluator_stack;\ 
       (_tmp)->evaluator_stack_malloced=evaluator_stack_malloced;\ 
       (_tmp)->fp=fp;\ 
       (_tmp)->mark_sp=mark_sp;\ 
       (_tmp)->mark_stack=mark_stack;\ 
       (_tmp)->mark_stack_malloced=mark_stack_malloced;\ 
       (_tmp)->recoveries=recoveries;\ 
       (_tmp)->sp=sp; \ 
       (_tmp)->thread_id=thread_id;\ 
      } while(0) 
 
#define SWAP_IN_THREAD(_tmp) do {\ 
       (_tmp)->swapped=0; \ 
       evaluator_stack=(_tmp)->evaluator_stack;\ 
       evaluator_stack_malloced=(_tmp)->evaluator_stack_malloced;\ 
       fp=(_tmp)->fp;\ 
       mark_sp=(_tmp)->mark_sp;\ 
       mark_stack=(_tmp)->mark_stack;\ 
       mark_stack_malloced=(_tmp)->mark_stack_malloced;\ 
       recoveries=(_tmp)->recoveries;\ 
       sp=(_tmp)->sp;\ 
       thread_id=(_tmp)->thread_id;\ 
     } while(0) 
 
#define SWAP_OUT_CURRENT_THREAD() \ 
  do {\ 
     struct thread_state *_tmp=(struct thread_state *)thread_id->storage; \ 
     SWAP_OUT_THREAD(_tmp); \ 
     THREADS_FPRINTF((stderr, "SWAP_OUT_CURRENT_THREAD() %s:%d t:%08x\n", \ 
                        __FILE__, __LINE__, (unsigned int)_tmp->thread_id)) \ 
 
#define SWAP_IN_CURRENT_THREAD() \ 
   THREADS_FPRINTF((stderr, "SWAP_IN_CURRENT_THREAD() %s:%d ... t:%08x\n", \ 
                    __FILE__, __LINE__, (unsigned int)_tmp->thread_id)); \ 
   SWAP_IN_THREAD(_tmp);\ 
 } while(0) 
 
#ifdef DEBUG 
/* Note that scalar types are used in place of pointers and vice versa 
 * below. This is intended to cause compiler warnings/errors if 
 * there is an attempt to use the global variables in an unsafe 
 * environment. 
 */ 
#define HIDE_GLOBAL_VARIABLES() do { \ 
   int sp = 0, evaluator_stack = 0, mark_sp = 0, mark_stack = 0, fp = 0; \ 
   void *evaluator_stack_malloced = NULL, *mark_stack_malloced = NULL; \ 
   int recoveries = 0, thread_id = 0; \ 
   int error = 0, xalloc = 0, low_my_putchar = 0, low_my_binary_strcat = 0; \ 
   int low_make_buf_space = 0, pop_n_elems = 0; \ 
   int push_sp_mark = 0, pop_sp_mark = 0 
 
/* Note that the semi-colon below is needed to add an empty statement 
 * in case there is a label before the macro. 
 */ 
#define REVEAL_GLOBAL_VARIABLES() ; } while(0) 
#else /* DEBUG */ 
#define HIDE_GLOBAL_VARIABLES() 
#define REVEAL_GLOBAL_VARIABLES() 
#endif /* DEBUG */ 
                            
 
#define THREADS_ALLOW() do { \ 
     struct thread_state *_tmp=(struct thread_state *)thread_id->storage; \ 
     if(num_threads > 1 && !threads_disabled) { \ 
       SWAP_OUT_THREAD(_tmp); \ 
       THREADS_FPRINTF((stderr, "THREADS_ALLOW() %s:%d t:%08x\n", \ 
                        __FILE__, __LINE__, (unsigned int)_tmp->thread_id)); \ 
       mt_unlock(& interpreter_lock); \ 
     } else {} \ 
     HIDE_GLOBAL_VARIABLES() 
 
#define THREADS_DISALLOW() \ 
     REVEAL_GLOBAL_VARIABLES(); \ 
     if(_tmp->swapped) { \ 
       mt_lock(& interpreter_lock); \ 
       THREADS_FPRINTF((stderr, "THREADS_DISALLOW() %s:%d ... t:%08x\n", \ 
                        __FILE__, __LINE__, (unsigned int)_tmp->thread_id)); \ 
       SWAP_IN_THREAD(_tmp);\ 
     } \ 
   } 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(void); 
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_cleanup(void); 
/* 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 HIDE_GLOBAL_VARIABLES() 
#define REVEAL_GLOBAL_VARIABLES() 
#define th_init() 
#define th_cleanup() 
#define th_init_programs() 
#define th_self() ((void*)0) 
#endif /* _REENTRANT */ 
 
 
extern int threads_disabled; 
 
#endif /* THREADS_H */