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* pthread_stop_world.c (GC_suspend_handler): Redirect to suspension
[pf3gnuchains/gcc-fork.git] / 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_SOLARIS_THREADS) \
7      && !defined(GC_WIN32_THREADS)
8      
9 #if defined(GC_DARWIN_THREADS)
10 # include "private/darwin_stop_world.h"
11 #else
12 # include "private/pthread_stop_world.h"
13 #endif
14
15 /* We use the allocation lock to protect thread-related data structures. */
16
17 /* The set of all known threads.  We intercept thread creation and      */
18 /* joins.                                                               */
19 /* Protected by allocation/GC lock.                                     */
20 /* Some of this should be declared volatile, but that's inconsistent    */
21 /* with some library routine declarations.                              */
22 typedef struct GC_Thread_Rep {
23     struct GC_Thread_Rep * next;  /* More recently allocated threads    */
24                                   /* with a given pthread id come       */
25                                   /* first.  (All but the first are     */
26                                   /* guaranteed to be dead, but we may  */
27                                   /* not yet have registered the join.) */
28     pthread_t id;
29     /* Extra bookkeeping information the stopping code uses */
30     struct thread_stop_info stop_info;
31     
32     short flags;
33 #       define FINISHED 1       /* Thread has exited.   */
34 #       define DETACHED 2       /* Thread is intended to be detached.   */
35 #       define MAIN_THREAD 4    /* True for the original thread only.   */
36 #       define SUSPENDED 8      /* True if thread was suspended externally */
37     short thread_blocked;       /* Protected by GC lock.                */
38                                 /* Treated as a boolean value.  If set, */
39                                 /* thread will acquire GC lock before   */
40                                 /* doing any pointer manipulations, and */
41                                 /* has set its sp value.  Thus it does  */
42                                 /* not need to be sent a signal to stop */
43                                 /* it.                                  */
44     ptr_t stack_end;            /* Cold end of the stack.               */
45 #   ifdef IA64
46         ptr_t backing_store_end;
47         ptr_t backing_store_ptr;
48 #   endif
49     void * status;              /* The value returned from the thread.  */
50                                 /* Used only to avoid premature         */
51                                 /* reclamation of any data it might     */
52                                 /* reference.                           */
53 #   ifdef THREAD_LOCAL_ALLOC
54 #       if CPP_WORDSZ == 64 && defined(ALIGN_DOUBLE)
55 #           define GRANULARITY 16
56 #           define NFREELISTS 49
57 #       else
58 #           define GRANULARITY 8
59 #           define NFREELISTS 65
60 #       endif
61         /* The ith free list corresponds to size i*GRANULARITY */
62 #       define INDEX_FROM_BYTES(n) ((ADD_SLOP(n) + GRANULARITY - 1)/GRANULARITY)
63 #       define BYTES_FROM_INDEX(i) ((i) * GRANULARITY - EXTRA_BYTES)
64 #       define SMALL_ENOUGH(bytes) (ADD_SLOP(bytes) <= \
65                                     (NFREELISTS-1)*GRANULARITY)
66         ptr_t ptrfree_freelists[NFREELISTS];
67         ptr_t normal_freelists[NFREELISTS];
68 #       ifdef GC_GCJ_SUPPORT
69           ptr_t gcj_freelists[NFREELISTS];
70 #       endif
71                 /* Free lists contain either a pointer or a small count */
72                 /* reflecting the number of granules allocated at that  */
73                 /* size.                                                */
74                 /* 0 ==> thread-local allocation in use, free list      */
75                 /*       empty.                                         */
76                 /* > 0, <= DIRECT_GRANULES ==> Using global allocation, */
77                 /*       too few objects of this size have been         */
78                 /*       allocated by this thread.                      */
79                 /* >= HBLKSIZE  => pointer to nonempty free list.       */
80                 /* > DIRECT_GRANULES, < HBLKSIZE ==> transition to      */
81                 /*    local alloc, equivalent to 0.                     */
82 #       define DIRECT_GRANULES (HBLKSIZE/GRANULARITY)
83                 /* Don't use local free lists for up to this much       */
84                 /* allocation.                                          */
85 #   endif
86 } * GC_thread;
87
88 # define THREAD_TABLE_SZ 128    /* Must be power of 2   */
89 extern volatile GC_thread GC_threads[THREAD_TABLE_SZ];
90
91 extern GC_bool GC_thr_initialized;
92
93 GC_thread GC_lookup_thread(pthread_t id);
94
95 void GC_stop_init();
96
97 extern GC_bool GC_in_thread_creation;
98         /* We may currently be in thread creation or destruction.       */
99         /* Only set to TRUE while allocation lock is held.              */
100         /* When set, it is OK to run GC from unknown thread.            */
101
102 #endif /* GC_PTHREADS && !GC_SOLARIS_THREADS.... etc */
103 #endif /* GC_PTHREAD_SUPPORT_H */