1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
/*
* pthreads_delay_np.c
*
* Description:
* This translation unit implements non-portable thread functions.
*
* --------------------------------------------------------------------------
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999,2005 Pthreads-win32 contributors
*
* Contact Email: rpj@callisto.canberra.edu.au
*
* The current list of contributors is contained
* in the file CONTRIBUTORS included with the source
* code distribution. The list can also be seen at the
* following World Wide Web location:
* http://sources.redhat.com/pthreads-win32/contributors.html
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library in the file COPYING.LIB;
* if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include "pthread.h"
#include "implement.h"
/*
* pthread_delay_np
*
* DESCRIPTION
*
* This routine causes a thread to delay execution for a specific period of time.
* This period ends at the current time plus the specified interval. The routine
* will not return before the end of the period is reached, but may return an
* arbitrary amount of time after the period has gone by. This can be due to
* system load, thread priorities, and system timer granularity.
*
* Specifying an interval of zero (0) seconds and zero (0) nanoseconds is
* allowed and can be used to force the thread to give up the processor or to
* deliver a pending cancelation request.
*
* The timespec structure contains the following two fields:
*
* tv_sec is an integer number of seconds.
* tv_nsec is an integer number of nanoseconds.
*
* Return Values
*
* If an error condition occurs, this routine returns an integer value indicating
* the type of error. Possible return values are as follows:
*
* 0
* Successful completion.
* [EINVAL]
* The value specified by interval is invalid.
*
* Example
*
* The following code segment would wait for 5 and 1/2 seconds
*
* struct timespec tsWait;
* int intRC;
*
* tsWait.tv_sec = 5;
* tsWait.tv_nsec = 500000000L;
* intRC = pthread_delay_np(&tsWait);
*/
int
pthread_delay_np (struct timespec *interval)
{
DWORD wait_time;
DWORD secs_in_millisecs;
DWORD millisecs;
DWORD status;
pthread_t self;
ptw32_thread_t * sp;
if (interval == NULL)
{
return EINVAL;
}
if (interval->tv_sec == 0L && interval->tv_nsec == 0L)
{
pthread_testcancel ();
Sleep (0);
pthread_testcancel ();
return (0);
}
/* convert secs to millisecs */
secs_in_millisecs = (DWORD)interval->tv_sec * 1000L;
/* convert nanosecs to millisecs (rounding up) */
millisecs = (interval->tv_nsec + 999999L) / 1000000L;
#if defined(__WATCOMC__)
#pragma disable_message (124)
#endif
/*
* Most compilers will issue a warning 'comparison always 0'
* because the variable type is unsigned, but we need to keep this
* for some reason I can't recall now.
*/
if (0 > (wait_time = secs_in_millisecs + millisecs))
{
return EINVAL;
}
#if defined(__WATCOMC__)
#pragma enable_message (124)
#endif
if (NULL == (self = pthread_self ()).p)
{
return ENOMEM;
}
sp = (ptw32_thread_t *) self.p;
if (sp->cancelState == PTHREAD_CANCEL_ENABLE)
{
/*
* Async cancelation won't catch us until wait_time is up.
* Deferred cancelation will cancel us immediately.
*/
if (WAIT_OBJECT_0 ==
(status = WaitForSingleObject (sp->cancelEvent, wait_time)))
{
ptw32_mcs_local_node_t stateLock;
/*
* Canceling!
*/
ptw32_mcs_lock_acquire (&sp->stateLock, &stateLock);
if (sp->state < PThreadStateCanceling)
{
sp->state = PThreadStateCanceling;
sp->cancelState = PTHREAD_CANCEL_DISABLE;
ptw32_mcs_lock_release (&stateLock);
ptw32_throw (PTW32_EPS_CANCEL);
}
ptw32_mcs_lock_release (&stateLock);
return ESRCH;
}
else if (status != WAIT_TIMEOUT)
{
return EINVAL;
}
}
else
{
Sleep (wait_time);
}
return (0);
}
|
