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memshm.h
1 //
2 // memshm.h
3 //
4 // Copyright (C) 1996 Limit Point Systems, Inc.
5 //
6 // Author: Curtis Janssen <cljanss@limitpt.com>
7 // Maintainer: LPS
8 //
9 // This file is part of the SC Toolkit.
10 //
11 // The SC Toolkit is free software; you can redistribute it and/or modify
12 // it under the terms of the GNU Library General Public License as published by
13 // the Free Software Foundation; either version 2, or (at your option)
14 // any later version.
15 //
16 // The SC Toolkit is distributed in the hope that it will be useful,
17 // but WITHOUT ANY WARRANTY; without even the implied warranty of
18 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 // GNU Library General Public License for more details.
20 //
21 // You should have received a copy of the GNU Library General Public License
22 // along with the SC Toolkit; see the file COPYING.LIB. If not, write to
23 // the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
24 //
25 // The U.S. Government is granted a limited license as per AL 91-7.
26 //
27
28 #ifdef __GNUC__
29 #pragma interface
30 #endif
31
32 #ifndef _util_group_memshm_h
33 #define _util_group_memshm_h
34
35 #include <sys/types.h>
36 #include <sys/ipc.h>
37 #include <sys/shm.h>
38 #include <iostream>
39
40 #include <util/group/globcnt.h>
41 #include <util/group/memmsg.h>
42
43 #include <util/group/rnglock.h>
44
45 namespace sc {
46
50 class ShmMemoryGrp: public MsgMemoryGrp {
51 private:
52 int nregion_;
53 int *shmid_;
54 void **attach_address_;
55 GlobalCounter lock_;
56 GlobalCounter *update_;
57 void *data_;
58 void *memory_;
59 Pool *pool_;
60 RangeLock *rangelock_; // the locks_ member of the base class is ignored
61
62 void clear_release_count();
63 void wait_for_release();
64 void note_release();
65 void obtain_lock();
66 void release_lock();
67
68 void cleanup();
69 int attach_memory(void *ataddress, int size);
70 void detach_memory();
71 public:
72 ShmMemoryGrp(const Ref<MessageGrp>& msg);
73 ShmMemoryGrp(const Ref<KeyVal>&);
74 ~ShmMemoryGrp();
75
76 void set_localsize(size_t);
77 void *localdata();
78
79 void *obtain_readwrite(distsize_t offset, int size);
80 void *obtain_readonly(distsize_t offset, int size);
81 void *obtain_writeonly(distsize_t offset, int size);
82 void release_readonly(void *data, distsize_t offset, int size);
83 void release_writeonly(void *data, distsize_t offset, int size);
84 void release_readwrite(void *data, distsize_t offset, int size);
85
86 void print(std::ostream &o = ExEnv::out0()) const;
87 };
88
89 }
90
91 #endif
92
93 // Local Variables:
94 // mode: c++
95 // c-file-style: "CLJ"
96 // End: