pthread_support.h

00001 #ifndef GC_PTHREAD_SUPPORT_H
00002 #define GC_PTHREAD_SUPPORT_H
00003 
00004 # include "private/gc_priv.h"
00005 
00006 # if defined(GC_PTHREADS) && !defined(GC_SOLARIS_THREADS) \
00007      && !defined(GC_WIN32_THREADS)
00008      
00009 #if defined(GC_DARWIN_THREADS)
00010 # include "private/darwin_stop_world.h"
00011 #else
00012 # include "private/pthread_stop_world.h"
00013 #endif
00014 
00015 /* We use the allocation lock to protect thread-related data structures. */
00016 
00017 /* The set of all known threads.  We intercept thread creation and  */
00018 /* joins.                               */
00019 /* Protected by allocation/GC lock.                 */
00020 /* Some of this should be declared volatile, but that's inconsistent    */
00021 /* with some library routine declarations.                  */
00022 typedef struct GC_Thread_Rep {
00023     struct GC_Thread_Rep * next;  /* More recently allocated threads    */
00024                   /* with a given pthread id come   */
00025                   /* first.  (All but the first are */
00026                   /* guaranteed to be dead, but we may  */
00027                   /* not yet have registered the join.) */
00028     pthread_t id;
00029     /* Extra bookkeeping information the stopping code uses */
00030     struct thread_stop_info stop_info;
00031     
00032     short flags;
00033 #   define FINISHED 1       /* Thread has exited.   */
00034 #   define DETACHED 2   /* Thread is intended to be detached.   */
00035 #   define MAIN_THREAD 4    /* True for the original thread only.   */
00036     short thread_blocked;   /* Protected by GC lock.        */
00037                     /* Treated as a boolean value.  If set, */
00038                     /* thread will acquire GC lock before   */
00039                     /* doing any pointer manipulations, and */
00040                     /* has set its sp value.  Thus it does  */
00041                     /* not need to be sent a signal to stop */
00042                     /* it.                  */
00043     ptr_t stack_end;        /* Cold end of the stack.       */
00044 #   ifdef IA64
00045     ptr_t backing_store_end;
00046     ptr_t backing_store_ptr;
00047 #   endif
00048     void * status;      /* The value returned from the thread.  */
00049                     /* Used only to avoid premature     */
00050                 /* reclamation of any data it might     */
00051                 /* reference.               */
00052 #   ifdef THREAD_LOCAL_ALLOC
00053 #   if CPP_WORDSZ == 64 && defined(ALIGN_DOUBLE)
00054 #       define GRANULARITY 16
00055 #       define NFREELISTS 49
00056 #   else
00057 #       define GRANULARITY 8
00058 #       define NFREELISTS 65
00059 #   endif
00060     /* The ith free list corresponds to size i*GRANULARITY */
00061 #   define INDEX_FROM_BYTES(n) ((ADD_SLOP(n) + GRANULARITY - 1)/GRANULARITY)
00062 #   define BYTES_FROM_INDEX(i) ((i) * GRANULARITY - EXTRA_BYTES)
00063 #   define SMALL_ENOUGH(bytes) (ADD_SLOP(bytes) <= \
00064                     (NFREELISTS-1)*GRANULARITY)
00065     ptr_t ptrfree_freelists[NFREELISTS];
00066     ptr_t normal_freelists[NFREELISTS];
00067 #   ifdef GC_GCJ_SUPPORT
00068       ptr_t gcj_freelists[NFREELISTS];
00069 #   endif
00070         /* Free lists contain either a pointer or a small count */
00071         /* reflecting the number of granules allocated at that  */
00072         /* size.                        */
00073         /* 0 ==> thread-local allocation in use, free list  */
00074         /*       empty.                     */
00075         /* > 0, <= DIRECT_GRANULES ==> Using global allocation, */
00076         /*       too few objects of this size have been     */
00077         /*   allocated by this thread.          */
00078         /* >= HBLKSIZE  => pointer to nonempty free list.   */
00079         /* > DIRECT_GRANULES, < HBLKSIZE ==> transition to  */
00080         /*    local alloc, equivalent to 0.         */
00081 #   define DIRECT_GRANULES (HBLKSIZE/GRANULARITY)
00082         /* Don't use local free lists for up to this much   */
00083         /* allocation.                      */
00084 #   endif
00085 } * GC_thread;
00086 
00087 # define THREAD_TABLE_SZ 128    /* Must be power of 2   */
00088 extern volatile GC_thread GC_threads[THREAD_TABLE_SZ];
00089 
00090 extern GC_bool GC_thr_initialized;
00091 
00092 GC_thread GC_lookup_thread(pthread_t id);
00093 
00094 void GC_stop_init();
00095 
00096 extern GC_bool GC_in_thread_creation;
00097     /* We may currently be in thread creation or destruction.   */
00098     /* Only set to TRUE while allocation lock is held.      */
00099     /* When set, it is OK to run GC from unknown thread.        */
00100 
00101 #endif /* GC_PTHREADS && !GC_SOLARIS_THREADS.... etc */
00102 #endif /* GC_PTHREAD_SUPPORT_H */