about summary refs log tree commit diff
path: root/sysdeps/sparc/sparc32/lowlevellock.c
blob: e502bf6f251df9984f87a7f4b6af25b8e86d6a15 (plain) (blame)
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
/* low level locking for pthread library.  SPARC version.
   Copyright (C) 2003-2017 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.

   The GNU C 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 2.1 of the License, or (at your option) any later version.

   The GNU C 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 the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <errno.h>
#include <sysdep.h>
#include <lowlevellock.h>
#include <sys/time.h>


void
__lll_lock_wait_private (int *futex)
{
  do
    {
      int oldval = atomic_compare_and_exchange_val_24_acq (futex, 2, 1);
      if (oldval != 0)
	lll_futex_wait (futex, 2, LLL_PRIVATE);
    }
  while (atomic_compare_and_exchange_val_24_acq (futex, 2, 0) != 0);
}


/* These functions don't get included in libc.so  */
#if IS_IN (libpthread)
void
__lll_lock_wait (int *futex, int private)
{
  do
    {
      int oldval = atomic_compare_and_exchange_val_24_acq (futex, 2, 1);
      if (oldval != 0)
	lll_futex_wait (futex, 2, private);
    }
  while (atomic_compare_and_exchange_val_24_acq (futex, 2, 0) != 0);
}


int
__lll_timedlock_wait (int *futex, const struct timespec *abstime, int private)
{
  /* Reject invalid timeouts.  */
  if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000)
    return EINVAL;

  do
    {
      struct timeval tv;
      struct timespec rt;

      /* Get the current time.  */
      (void) __gettimeofday (&tv, NULL);

      /* Compute relative timeout.  */
      rt.tv_sec = abstime->tv_sec - tv.tv_sec;
      rt.tv_nsec = abstime->tv_nsec - tv.tv_usec * 1000;
      if (rt.tv_nsec < 0)
	{
	  rt.tv_nsec += 1000000000;
	  --rt.tv_sec;
	}

      /* Already timed out?  */
      if (rt.tv_sec < 0)
	return ETIMEDOUT;

      /* Wait.  */
      int oldval = atomic_compare_and_exchange_val_24_acq (futex, 2, 1);
      if (oldval != 0)
	lll_futex_timed_wait (futex, 2, &rt, private);
    }
  while (atomic_compare_and_exchange_val_24_acq (futex, 2, 0) != 0);

  return 0;
}


int
__lll_timedwait_tid (int *tidp, const struct timespec *abstime)
{
  int tid;

  if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000)
    return EINVAL;

  /* Repeat until thread terminated.  */
  while ((tid = *tidp) != 0)
    {
      struct timeval tv;
      struct timespec rt;

      /* Get the current time.  */
      (void) __gettimeofday (&tv, NULL);

      /* Compute relative timeout.  */
      rt.tv_sec = abstime->tv_sec - tv.tv_sec;
      rt.tv_nsec = abstime->tv_nsec - tv.tv_usec * 1000;
      if (rt.tv_nsec < 0)
	{
	  rt.tv_nsec += 1000000000;
	  --rt.tv_sec;
	}

      /* Already timed out?  */
      if (rt.tv_sec < 0)
	return ETIMEDOUT;

      /* Wait until thread terminates.  The kernel so far does not use
	 the private futex operations for this.  */
      if (lll_futex_timed_wait (tidp, tid, &rt, LLL_SHARED) == -ETIMEDOUT)
	return ETIMEDOUT;
    }

  return 0;
}
#endif