src/mm/boehm-gc/include/private/pthread_support.h

   1 #ifndef GC_PTHREAD_SUPPORT_H
   2 #define GC_PTHREAD_SUPPORT_H
   3
   4 # include "private/gc_priv.h"
   5
   6 # if defined(GC_PTHREADS) && !defined(GC_WIN32_THREADS)
   7
   8 #if defined(GC_DARWIN_THREADS)
   9 # include "private/darwin_stop_world.h"
  10 #else
  11 # include "private/pthread_stop_world.h"
  12 #endif
  13
  14 #ifdef THREAD_LOCAL_ALLOC
  15 # include "thread_local_alloc.h"
  16 #endif /* THREAD_LOCAL_ALLOC */
  17
  18 /* We use the allocation lock to protect thread-related data structures. */
  19
  20 /* The set of all known threads.  We intercept thread creation and      */
  21 /* joins.                                                               */
  22 /* Protected by allocation/GC lock.                                     */
  23 /* Some of this should be declared volatile, but that's inconsistent    */
  24 /* with some library routine declarations.                              */
  25 typedef struct GC_Thread_Rep {
  26     struct GC_Thread_Rep * next;  /* More recently allocated threads    */
  27                                   /* with a given pthread id come       */
  28                                   /* first.  (All but the first are     */
  29                                   /* guaranteed to be dead, but we may  */
  30                                   /* not yet have registered the join.) */
  31     pthread_t id;
  32     /* Extra bookkeeping information the stopping code uses */
  33     struct thread_stop_info stop_info;
  34
  35     short flags;
  36 #       define FINISHED 1       /* Thread has exited.   */
  37 #       define DETACHED 2       /* Thread is treated as detached.       */
  38                                 /* Thread may really be detached, or    */
  39                                 /* it may have have been explicitly     */
  40                                 /* registered, in which case we can     */
  41                                 /* deallocate its GC_Thread_Rep once    */
  42                                 /* it unregisters itself, since it      */
  43                                 /* may not return a GC pointer.         */
  44 #       define MAIN_THREAD 4    /* True for the original thread only.   */
  45     short thread_blocked;       /* Protected by GC lock.                */
  46                                 /* Treated as a boolean value.  If set, */
  47                                 /* thread will acquire GC lock before   */
  48                                 /* doing any pointer manipulations, and */
  49                                 /* has set its sp value.  Thus it does  */
  50                                 /* not need to be sent a signal to stop */
  51                                 /* it.                                  */
  52     ptr_t stack_end;            /* Cold end of the stack (except for    */
  53                                 /* main thread).                        */
  54 #   ifdef IA64
  55         ptr_t backing_store_end;
  56         ptr_t backing_store_ptr;
  57 #   endif
  58     void * status;              /* The value returned from the thread.  */
  59                                 /* Used only to avoid premature         */
  60                                 /* reclamation of any data it might     */
  61                                 /* reference.                           */
  62                                 /* This is unfortunately also the       */
  63                                 /* reason we need to intercept join     */
  64                                 /* and detach.                          */
  65 #   ifdef THREAD_LOCAL_ALLOC
  66         struct thread_local_freelists tlfs;
  67 #   endif
  68 } * GC_thread;
  69
  70 # define THREAD_TABLE_SZ 256    /* Must be power of 2   */
  71 extern volatile GC_thread GC_threads[THREAD_TABLE_SZ];
  72
  73 extern GC_bool GC_thr_initialized;
  74
  75 GC_thread GC_lookup_thread(pthread_t id);
  76
  77 void GC_stop_init(void);
  78
  79 extern GC_bool GC_in_thread_creation;
  80         /* We may currently be in thread creation or destruction.       */
  81         /* Only set to TRUE while allocation lock is held.              */
  82         /* When set, it is OK to run GC from unknown thread.            */
  83
  84 #endif /* GC_PTHREADS && !GC_SOLARIS_THREADS.... etc */
  85 #endif /* GC_PTHREAD_SUPPORT_H */