2 gs.keenan 1.1 //
3 // Copyright (c) 2000, 2001, 2002 BMC Software; Hewlett-Packard Development
4 // Company, L.P.; IBM Corp.; The Open Group; Tivoli Systems.
5 // Copyright (c) 2003 BMC Software; Hewlett-Packard Development Company, L.P.;
6 // IBM Corp.; EMC Corporation, The Open Group.
7 // Copyright (c) 2004 BMC Software; Hewlett-Packard Development Company, L.P.;
8 // IBM Corp.; EMC Corporation; VERITAS Software Corporation; The Open Group.
|
11 gs.keenan 1.1 //
12 // Permission is hereby granted, free of charge, to any person obtaining a copy
13 // of this software and associated documentation files (the "Software"), to
14 // deal in the Software without restriction, including without limitation the
15 // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
16 // sell copies of the Software, and to permit persons to whom the Software is
17 // furnished to do so, subject to the following conditions:
18 //
19 // THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE SHALL BE INCLUDED IN
20 // ALL COPIES OR SUBSTANTIAL PORTIONS OF THE SOFTWARE. THE SOFTWARE IS PROVIDED
21 // "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
22 // LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
23 // PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
24 // HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
25 // ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
27 //
28 //==============================================================================
29 //
30 // Author: Markus Mueller (sedgewick_de@yahoo.de)
31 //
32 gs.keenan 1.1 // Modified By: Sean Keenan (sean.keenan@hp.com)
33 //
34 //%/////////////////////////////////////////////////////////////////////////////
35
36 #ifndef IPC_VMS_include
37 #define IPC_VMS_include
38
39 #include <pthread.h>
40 #include <signal.h>
41 #include <errno.h>
42 #include <sys/time.h>
43 #include <time.h>
44
45 PEGASUS_NAMESPACE_BEGIN
46
47 int timeval_subtract (struct timeval *result,
48 struct timeval *x,
49 struct timeval *y);
50
51
52 typedef pthread_t PEGASUS_THREAD_TYPE;
53 gs.keenan 1.1 typedef pthread_mutex_t PEGASUS_MUTEX_TYPE;
54
55 typedef struct {
56 Uint32 waiters;
57 pthread_mutex_t mutex;
58 pthread_cond_t cond;
59 pthread_t owner;
60 } PEGASUS_SEM_HANDLE ;
61
62 typedef struct {
63 pthread_mutex_t mut;
64 pthread_mutexattr_t mutatt;
65 pthread_t owner;
66 } PEGASUS_MUTEX_HANDLE ;
67
68 typedef void *PEGASUS_CLEANUP_HANDLE;
69 typedef void *PEGASUS_THREAD_RETURN;
70
71 #define PEGASUS_THREAD_CDECL
72
73 typedef struct {
74 gs.keenan 1.1 pthread_t thid;
75 pthread_attr_t thatt;
76 } PEGASUS_THREAD_HANDLE ;
77
78 //-----------------------------------------------------------------
79 /// Conditionals to support native or generic Conditional Semaphore
80 //-----------------------------------------------------------------
81
82 #define PEGASUS_CONDITIONAL_NATIVE = 1
83
84 typedef pthread_cond_t PEGASUS_COND_TYPE;
85
86 typedef struct {
87 pthread_cond_t cond;
88 pthread_t owner;
89 } PEGASUS_COND_HANDLE;
90
91
92 //-----------------------------------------------------------------
93 /// Conditionals to support native or generic read/write semaphores
94 //-----------------------------------------------------------------
95 gs.keenan 1.1
96
97 //-----------------------------------------------------------------
98 // NOTE: Tue Oct 9 13:36:53 2001 mdday
99 //
100 // I put some read/write counting into the Thread test program to see
101 // how native r/w performance compares to generic r/w on linux.
102 // For RH linux 7.1, the generic r/w lock in IPC.cpp performs
103 // much better than the pthreads native implementation.
104 //
105 // Here are the data (remember that there are 4 readers for every one
106 // writer):
107 //
108 // Generic read operations 6538 <- 4:1 ratio of reads to writes
109 // write operations 1422
110 //
111 // Native read operations 2060 <- 1:1 even though there are
112 // write operations 2033 4 readers for every writer
113 //
114 //
115 // Comments -
116 gs.keenan 1.1 //
117 // The native implementation prefers writers, which slows the entire
118 // test down because write operations take longer than read operations.
119 // Moreover, as soon as one writer gains the lock, the next owner will
120 // always be a writer until there are no further writers. Readers are
121 // blocked out until all writers are sleeping.
122 //
123 // In the test there are 4 readers for every writer. However, the
124 // native r/w lock severely skews resources toward writers.
125 //
126 // The generic implementation has no preference among readers and writers.
127 // Therefore whichever thread is ready to read or write will gain the lock
128 // with no dependence on whether the predecessor is a reader or writer.
129 // This results in higher throughput in the test program for linux.
130 //
131 // I would encourage all the platform maintainers to run their own tests
132 // so we can decide which implementation to use for production builds.
133 //
134 //-----------------------------------------------------------------
135
136
137 gs.keenan 1.1 inline void pegasus_yield(void)
138 {
139 sched_yield();
140 }
141
142 // pthreads cancellation calls
143 inline void disable_cancel(void)
144 {
|
151 gs.keenan 1.1 }
152
153 inline void pegasus_sleep(int msec)
154 {
155 sleep(msec/1000);
156 }
157
158 inline static int pegasus_gettimeofday(struct timeval *tv)
159 {
160 return(gettimeofday(tv, NULL));
161 }
162
163 inline void exit_thread(PEGASUS_THREAD_RETURN rc)
164 {
165 pthread_exit(rc);
166 }
167
168 inline PEGASUS_THREAD_TYPE pegasus_thread_self(void)
169 {
170 return(pthread_self());
171 }
172 gs.keenan 1.1
173 // l10n start
174 typedef pthread_key_t PEGASUS_THREAD_KEY_TYPE;
175
176 inline Uint32 pegasus_key_create(PEGASUS_THREAD_KEY_TYPE * key)
177 {
178 // Note: a destructor is not supported
179 // (because not supported on Windows (?))
180 return pthread_key_create(key, NULL);
181 }
182
183 inline Uint32 pegasus_key_delete(PEGASUS_THREAD_KEY_TYPE key)
184 {
185 return pthread_key_delete(key);
186 }
187
188 inline void * pegasus_get_thread_specific(PEGASUS_THREAD_KEY_TYPE key)
189 {
190 return pthread_getspecific(key);
191 }
192
193 gs.keenan 1.1 inline Uint32 pegasus_set_thread_specific(PEGASUS_THREAD_KEY_TYPE key,
194 void * value)
195 {
196 return pthread_setspecific(key, value);
197 }
198 // l10n end
199
200
201 inline void destroy_thread(PEGASUS_THREAD_TYPE th, PEGASUS_THREAD_RETURN rc)
202 {
203 pthread_cancel(th);
204 }
205
206 PEGASUS_NAMESPACE_END
207
208 #endif // IPCVMS_Include
|
Return to
IPCVms.h
CVS log
Up to [Pegasus] / pegasus / src / Pegasus / Common