#ifndef GC_PTHREAD_SUPPORT_H
#define GC_PTHREAD_SUPPORT_H

# include "private/gc_priv.h"

# if defined(GC_PTHREADS) && !defined(GC_WIN32_THREADS)
     
#if defined(GC_DARWIN_THREADS)
# include "private/darwin_stop_world.h"
#else
# include "private/pthread_stop_world.h"
#endif

#ifdef THREAD_LOCAL_ALLOC
# include "thread_local_alloc.h"
#endif /* THREAD_LOCAL_ALLOC */

/* We use the allocation lock to protect thread-related data structures. */

/* The set of all known threads.  We intercept thread creation and 	*/
/* joins.								*/
/* Protected by allocation/GC lock.					*/
/* Some of this should be declared volatile, but that's inconsistent	*/
/* with some library routine declarations.  		 		*/
typedef struct GC_Thread_Rep {
    struct GC_Thread_Rep * next;  /* More recently allocated threads	*/
				  /* with a given pthread id come 	*/
				  /* first.  (All but the first are	*/
				  /* guaranteed to be dead, but we may  */
				  /* not yet have registered the join.) */
    pthread_t id;
    /* Extra bookkeeping information the stopping code uses */
    struct thread_stop_info stop_info;
    
    short flags;
#	define FINISHED 1   	/* Thread has exited.	*/
#	define DETACHED 2	/* Thread is treated as detached.	*/
    				/* Thread may really be detached, or	*/
    				/* it may have have been explicitly	*/
    				/* registered, in which case we can	*/
    				/* deallocate its GC_Thread_Rep once	*/
    				/* it unregisters itself, since it	*/
    				/* may not return a GC pointer.		*/
#	define MAIN_THREAD 4	/* True for the original thread only.	*/
    short thread_blocked;	/* Protected by GC lock.		*/
    				/* Treated as a boolean value.  If set,	*/
    				/* thread will acquire GC lock before	*/
    				/* doing any pointer manipulations, and	*/
    				/* has set its sp value.  Thus it does	*/
    				/* not need to be sent a signal to stop	*/
    				/* it.					*/
    ptr_t stack_end;		/* Cold end of the stack.		*/
#   ifdef IA64
	ptr_t backing_store_end;
	ptr_t backing_store_ptr;
#   endif
    void * status;		/* The value returned from the thread.  */
    				/* Used only to avoid premature 	*/
				/* reclamation of any data it might 	*/
				/* reference.				*/
    				/* This is unfortunately also the	*/
    				/* reason we need to intercept join	*/
    				/* and detach.				*/
#   ifdef THREAD_LOCAL_ALLOC
        struct thread_local_freelists tlfs;
#   endif
} * GC_thread;

# define THREAD_TABLE_SZ 256	/* Must be power of 2	*/
extern volatile GC_thread GC_threads[THREAD_TABLE_SZ];

extern GC_bool GC_thr_initialized;

GC_thread GC_lookup_thread(pthread_t id);

void GC_stop_init();

void GC_thr_init(void);

extern GC_bool GC_in_thread_creation;
	/* We may currently be in thread creation or destruction.	*/
	/* Only set to TRUE while allocation lock is held.		*/
	/* When set, it is OK to run GC from unknown thread.		*/

#endif /* GC_PTHREADS && !GC_SOLARIS_THREADS.... etc */
#endif /* GC_PTHREAD_SUPPORT_H */
