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atomicio.cc
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1 /*
2  * Copyright (c) 2008 The Hewlett-Packard Development Company
3  * All rights reserved.
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10  * notice, this list of conditions and the following disclaimer in the
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12  * neither the name of the copyright holders nor the names of its
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14  * this software without specific prior written permission.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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27  */
28 
29 #include "base/atomicio.hh"
30 
31 #include <cerrno>
32 #include <cstdio>
33 
34 namespace gem5
35 {
36 
37 ssize_t
38 atomic_read(int fd, void *s, size_t n)
39 {
40  char *p = reinterpret_cast<char *>(s);
41  size_t pos = 0;
42 
43  // Keep reading until we've gotten all of the data.
44  while (n > pos) {
45  ssize_t result = read(fd, p + pos, n - pos);
46 
47  // We didn't get any more data, so we should probably punt,
48  // otherwise we'd just keep spinning
49  if (result == 0)
50  break;
51 
52  // If there was an error, try again on EINTR/EAGAIN, pass the
53  // error up otherwise.
54  if (result == -1) {
55  if (errno == EINTR || errno == EAGAIN)
56  continue;
57  return result;
58  }
59 
60  pos += result;
61  }
62 
63  return pos;
64 }
65 
66 ssize_t
67 atomic_write(int fd, const void *s, size_t n)
68 {
69  const char *p = reinterpret_cast<const char *>(s);
70  size_t pos = 0;
71 
72  // Keep writing until we've written all of the data
73  while (n > pos) {
74  ssize_t result = write(fd, p + pos, n - pos);
75 
76  // We didn't manage to write anything this time, so we should
77  // probably punt, otherwise we'd just keep spinning
78  if (result == 0)
79  break;
80 
81  // If there was an error, try again on EINTR/EAGAIN, pass the
82  // error up otherwise.
83  if (result == -1) {
84  if (errno == EINTR || errno == EAGAIN)
85  continue;
86  return result;
87  }
88 
89  pos += result;
90  }
91 
92  return pos;
93 }
94 
95 } // namespace gem5
gem5::ArmISA::fd
Bitfield< 14, 12 > fd
Definition: types.hh:150
atomicio.hh
gem5::atomic_read
ssize_t atomic_read(int fd, void *s, size_t n)
Definition: atomicio.cc:38
gem5::MipsISA::p
Bitfield< 0 > p
Definition: pra_constants.hh:326
gem5::ArmISA::s
Bitfield< 4 > s
Definition: misc_types.hh:562
gem5::atomic_write
ssize_t atomic_write(int fd, const void *s, size_t n)
Definition: atomicio.cc:67
gem5::ArmISA::n
Bitfield< 31 > n
Definition: misc_types.hh:456
gem5
Reference material can be found at the JEDEC website: UFS standard http://www.jedec....
Definition: tlb.cc:60
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