2 /*--------------------------------------------------------------------*/
3 /*--- LibHB: a library for implementing and checking ---*/
4 /*--- the happens-before relationship in concurrent programs. ---*/
5 /*--- libhb_main.c ---*/
6 /*--------------------------------------------------------------------*/
9 This file is part of LibHB, a library for implementing and checking
10 the happens-before relationship in concurrent programs.
12 Copyright (C) 2008-2010 OpenWorks Ltd
15 This program is free software; you can redistribute it and/or
16 modify it under the terms of the GNU General Public License as
17 published by the Free Software Foundation; either version 2 of the
18 License, or (at your option) any later version.
20 This program is distributed in the hope that it will be useful, but
21 WITHOUT ANY WARRANTY; without even the implied warranty of
22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 General Public License for more details.
25 You should have received a copy of the GNU General Public License
26 along with this program; if not, write to the Free Software
27 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
30 The GNU General Public License is contained in the file COPYING.
36 /* Abstract to user: thread identifiers */
37 /* typedef struct _Thr Thr; */ /* now in hg_lock_n_thread.h */
39 /* Abstract to user: synchronisation objects */
40 /* typedef struct _SO SO; */ /* now in hg_lock_n_thread.h */
42 /* Initialise library; returns Thr* for root thread. 'shadow_alloc'
43 should never return NULL, instead it should simply not return if
44 they encounter an out-of-memory condition. */
46 void (*get_stacktrace)( Thr*, Addr*, UWord ),
47 ExeContext* (*get_EC)( Thr* )
50 /* Shut down the library, and print stats (in fact that's _all_
52 void libhb_shutdown ( Bool show_stats );
54 /* Thread creation: returns Thr* for new thread */
55 Thr* libhb_create ( Thr* parent );
57 /* Thread async exit */
58 void libhb_async_exit ( Thr* exitter );
60 /* Synchronisation objects (abstract to caller) */
62 /* Allocate a new one (alloc'd by library) */
63 SO* libhb_so_alloc ( void );
66 void libhb_so_dealloc ( SO* so );
68 /* Send a message via a sync object. If strong_send is true, the
69 resulting inter-thread dependency seen by a future receiver of this
70 message will be a dependency on this thread only. That is, in a
71 strong send, the VC inside the SO is replaced by the clock of the
72 sending thread. For a weak send, the sender's VC is joined into
73 that already in the SO, if any. This subtlety is needed to model
74 rwlocks: a strong send corresponds to releasing a rwlock that had
75 been w-held (or releasing a standard mutex). A weak send
76 corresponds to releasing a rwlock that has been r-held.
78 (rationale): Since in general many threads may hold a rwlock in
79 r-mode, a weak send facility is necessary in order that the final
80 SO reflects the join of the VCs of all the threads releasing the
81 rwlock, rather than merely holding the VC of the most recent thread
83 void libhb_so_send ( Thr* thr, SO* so, Bool strong_send );
85 /* Recv a message from a sync object. If strong_recv is True, the
86 resulting inter-thread dependency is considered adequate to induce
87 a h-b ordering on both reads and writes. If it is False, the
88 implied h-b ordering exists only for reads, not writes. This is
89 subtlety is required in order to support reader-writer locks: a
90 thread doing a write-acquire of a rwlock (or acquiring a normal
91 mutex) models this by doing a strong receive. A thread doing a
92 read-acquire of a rwlock models this by doing a !strong_recv. */
93 void libhb_so_recv ( Thr* thr, SO* so, Bool strong_recv );
95 /* Has this SO ever been sent on? */
96 Bool libhb_so_everSent ( SO* so );
98 /* Memory accesses (1/2/4/8 byte size). They report a race if one is
100 #define LIBHB_CWRITE_1(_thr,_a) zsm_sapply08_f__msmcwrite((_thr),(_a))
101 #define LIBHB_CWRITE_2(_thr,_a) zsm_sapply16_f__msmcwrite((_thr),(_a))
102 #define LIBHB_CWRITE_4(_thr,_a) zsm_sapply32_f__msmcwrite((_thr),(_a))
103 #define LIBHB_CWRITE_8(_thr,_a) zsm_sapply64_f__msmcwrite((_thr),(_a))
104 #define LIBHB_CWRITE_N(_thr,_a,_n) zsm_sapplyNN_f__msmcwrite((_thr),(_a),(_n))
106 #define LIBHB_CREAD_1(_thr,_a) zsm_sapply08_f__msmcread((_thr),(_a))
107 #define LIBHB_CREAD_2(_thr,_a) zsm_sapply16_f__msmcread((_thr),(_a))
108 #define LIBHB_CREAD_4(_thr,_a) zsm_sapply32_f__msmcread((_thr),(_a))
109 #define LIBHB_CREAD_8(_thr,_a) zsm_sapply64_f__msmcread((_thr),(_a))
110 #define LIBHB_CREAD_N(_thr,_a,_n) zsm_sapplyNN_f__msmcread((_thr),(_a),(_n))
112 void zsm_sapply08_f__msmcwrite ( Thr* thr, Addr a );
113 void zsm_sapply16_f__msmcwrite ( Thr* thr, Addr a );
114 void zsm_sapply32_f__msmcwrite ( Thr* thr, Addr a );
115 void zsm_sapply64_f__msmcwrite ( Thr* thr, Addr a );
116 void zsm_sapplyNN_f__msmcwrite ( Thr* thr, Addr a, SizeT len );
118 void zsm_sapply08_f__msmcread ( Thr* thr, Addr a );
119 void zsm_sapply16_f__msmcread ( Thr* thr, Addr a );
120 void zsm_sapply32_f__msmcread ( Thr* thr, Addr a );
121 void zsm_sapply64_f__msmcread ( Thr* thr, Addr a );
122 void zsm_sapplyNN_f__msmcread ( Thr* thr, Addr a, SizeT len );
124 void libhb_Thr_resumes ( Thr* thr );
126 /* Set memory address ranges to new (freshly allocated), or noaccess
127 (no longer accessible). NB: "AHAE" == "Actually Has An Effect" :-) */
128 void libhb_srange_new ( Thr*, Addr, SizeT );
129 void libhb_srange_untrack ( Thr*, Addr, SizeT );
130 void libhb_srange_noaccess_NoFX ( Thr*, Addr, SizeT ); /* IS IGNORED */
131 void libhb_srange_noaccess_AHAE ( Thr*, Addr, SizeT ); /* IS NOT IGNORED */
133 /* Get and set the hgthread (pointer to corresponding Thread
135 Thread* libhb_get_Thr_hgthread ( Thr* );
136 void libhb_set_Thr_hgthread ( Thr*, Thread* );
138 /* Low level copy of shadow state from [src,src+len) to [dst,dst+len).
139 Overlapping moves are checked for and asserted against. */
140 void libhb_copy_shadow_state ( Thr* thr, Addr src, Addr dst, SizeT len );
142 /* Call this periodically to give libhb the opportunity to
143 garbage-collect its internal data structures. */
144 void libhb_maybe_GC ( void );
146 /* Extract info from the conflicting-access machinery. */
147 Bool libhb_event_map_lookup ( /*OUT*/ExeContext** resEC,
149 /*OUT*/SizeT* resSzB,
151 Thr* thr, Addr a, SizeT szB, Bool isW );
153 #endif /* __LIBHB_H */
155 /*--------------------------------------------------------------------*/
156 /*--- end libhb.h ---*/
157 /*--------------------------------------------------------------------*/