libgc/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_SOLARIS_THREADS) \
   7      && !defined(GC_WIN32_THREADS)
   8
   9 #if defined(GC_DARWIN_THREADS)
  10 # include "private/darwin_stop_world.h"
  11 #elif defined(GC_OPENBSD_THREADS)
  12 # include "private/openbsd_stop_world.h"
  13 #else
  14 # include "private/pthread_stop_world.h"
  15 #endif
  16
  17 /* We use the allocation lock to protect thread-related data structures. */
  18
  19 #ifdef THREAD_LOCAL_ALLOC
  20 #   if CPP_WORDSZ == 64 && defined(ALIGN_DOUBLE)
  21 #       define GRANULARITY 16
  22 #       define NFREELISTS 49
  23 #   else
  24 #       define GRANULARITY 8
  25 #       define NFREELISTS 65
  26 #   endif
  27     struct thread_local_freelists {
  28         ptr_t ptrfree_freelists[NFREELISTS];
  29         ptr_t normal_freelists[NFREELISTS];
  30 #       ifdef GC_GCJ_SUPPORT
  31             ptr_t gcj_freelists[NFREELISTS];
  32 #       endif
  33     };
  34 #endif
  35
  36 /* The set of all known threads.  We intercept thread creation and      */
  37 /* joins.                                                               */
  38 /* Protected by allocation/GC lock.                                     */
  39 /* Some of this should be declared volatile, but that's inconsistent    */
  40 /* with some library routine declarations.                              */
  41 typedef struct GC_Thread_Rep {
  42     struct GC_Thread_Rep * next;  /* More recently allocated threads    */
  43                                   /* with a given pthread id come       */
  44                                   /* first.  (All but the first are     */
  45                                   /* guaranteed to be dead, but we may  */
  46                                   /* not yet have registered the join.) */
  47     pthread_t id;
  48 #ifdef HOST_ANDROID
  49     pid_t kernel_id;
  50 #endif
  51     /* Extra bookkeeping information the stopping code uses */
  52     struct thread_stop_info stop_info;
  53
  54     short flags;
  55 #       define FINISHED 1       /* Thread has exited.   */
  56 #       define DETACHED 2       /* Thread is intended to be detached.   */
  57 #       define MAIN_THREAD 4    /* True for the original thread only.   */
  58 #       define FOREIGN_THREAD 8 /* Will not be de-registered by us      */
  59     short thread_blocked;       /* Protected by GC lock.                */
  60                                 /* Treated as a boolean value.  If set, */
  61                                 /* thread will acquire GC lock before   */
  62                                 /* doing any pointer manipulations, and */
  63                                 /* has set its sp value.  Thus it does  */
  64                                 /* not need to be sent a signal to stop */
  65                                 /* it.                                  */
  66     ptr_t stack_end;            /* Cold end of the stack.               */
  67         ptr_t altstack; /* The start of the altstack if there is one, NULL otherwise */
  68         int altstack_size; /* The size of the altstack if there is one */
  69         ptr_t stack; /* The start of the normal stack */
  70         int stack_size; /* The size of the normal stack */
  71 #   ifdef IA64
  72         ptr_t backing_store_end;
  73         ptr_t backing_store_ptr;
  74 #   endif
  75     void * status;              /* The value returned from the thread.  */
  76                                 /* Used only to avoid premature         */
  77                                 /* reclamation of any data it might     */
  78                                 /* reference.                           */
  79 #   ifdef THREAD_LOCAL_ALLOC
  80         /* The ith free list corresponds to size i*GRANULARITY */
  81 #       define INDEX_FROM_BYTES(n) ((ADD_SLOP(n) + GRANULARITY - 1)/GRANULARITY)
  82 #       define BYTES_FROM_INDEX(i) ((i) * GRANULARITY - EXTRA_BYTES)
  83 #       define SMALL_ENOUGH(bytes) (ADD_SLOP(bytes) <= \
  84                                     (NFREELISTS-1)*GRANULARITY)
  85         struct thread_local_freelists tlfs;
  86                 /* Free lists contain either a pointer or a small count */
  87                 /* reflecting the number of granules allocated at that  */
  88                 /* size.                                                */
  89                 /* 0 ==> thread-local allocation in use, free list      */
  90                 /*       empty.                                         */
  91                 /* > 0, <= DIRECT_GRANULES ==> Using global allocation, */
  92                 /*       too few objects of this size have been         */
  93                 /*       allocated by this thread.                      */
  94                 /* >= HBLKSIZE  => pointer to nonempty free list.       */
  95                 /* > DIRECT_GRANULES, < HBLKSIZE ==> transition to      */
  96                 /*    local alloc, equivalent to 0.                     */
  97 #       define DIRECT_GRANULES (HBLKSIZE/GRANULARITY)
  98                 /* Don't use local free lists for up to this much       */
  99                 /* allocation.                                          */
 100 #   endif
 101 } * GC_thread;
 102
 103 # define THREAD_TABLE_SZ 128    /* Must be power of 2   */
 104 extern volatile GC_thread GC_threads[THREAD_TABLE_SZ];
 105 #ifdef NACL
 106 extern __thread GC_thread gc_thread_self;
 107 #endif
 108
 109 extern GC_bool GC_thr_initialized;
 110
 111 GC_thread GC_lookup_thread(pthread_t id);
 112
 113 void GC_thread_deregister_foreign (void *data);
 114
 115 void GC_stop_init(void);
 116
 117 extern GC_bool GC_in_thread_creation;
 118         /* We may currently be in thread creation or destruction.       */
 119         /* Only set to TRUE while allocation lock is held.              */
 120         /* When set, it is OK to run GC from unknown thread.            */
 121
 122 #endif /* GC_PTHREADS && !GC_SOLARIS_THREADS.... etc */
 123 #endif /* GC_PTHREAD_SUPPORT_H */