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atomicio.hh
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1 /*
2  * Copyright (c) 2008 The Hewlett-Packard Development Company
3  * All rights reserved.
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14  * this software without specific prior written permission.
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17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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28  * Authors: Nathan Binkert
29  */
30 
31 #ifndef __BASE_ATOMICIO_HH__
32 #define __BASE_ATOMICIO_HH__
33 
34 #include <unistd.h>
35 
36 // These functions keep reading/writing, if possible, until all data
37 // has been transferred. Basically, try again when there's no error,
38 // but there is data left also retry on EINTR.
39 // This function blocks until it is done.
40 
41 ssize_t atomic_read(int fd, void *s, size_t n);
42 ssize_t atomic_write(int fd, const void *s, size_t n);
43 
52 #define STATIC_MSG(fd, m) \
53  do { \
54  static const char msg[] = m; \
55  atomic_write(fd, msg, sizeof(msg) - 1); \
56  } while (0)
57 
66 #define STATIC_ERR(m) STATIC_MSG(STDERR_FILENO, m)
67 
68 #endif // __BASE_ATOMICIO_HH__
Bitfield< 31 > n
Definition: miscregs.hh:1636
Bitfield< 4 > s
Definition: miscregs.hh:1738
ssize_t atomic_write(int fd, const void *s, size_t n)
Definition: atomicio.cc:66
ssize_t atomic_read(int fd, void *s, size_t n)
Definition: atomicio.cc:37
Bitfield< 14, 12 > fd
Definition: types.hh:155

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