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Last change
on this file was 2260, checked in by bird, 20 years ago |
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o Started fixing exec() backend.
o Fixed some more mktime / localtime bugs.
o Fixed crash on simple LIBC_ASSERT() caused by NULL format string.
o Generate device numbers for devices and pipes too.
o Fixed mixup of Dev and Inode during filehandle inheritance.
o Fixed dup and dup2 bug in relation to the FD_CLOEXEC clearing.
o Fixed bug in codepage normalization during setlocale().
o Fixed bug in regex where the lock was overwritten after initialization.
o Switch the glibc locks to smutex to avoid leaking event semaphores.
o Added _smutex_try_request().
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Property cvs2svn:cvs-rev
set to
1.3
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Property svn:eol-style
set to
native
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Property svn:executable
set to
*
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File size:
1.1 KB
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| 1 | /* sys/smutex.h (emx+gcc) */
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| 2 |
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| 3 | /* Simple mutex semaphores. These semaphores need not be created and
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| 4 | destroyed, _smutex objects just have to be initialized to zero.
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| 5 | _smutex semaphores are implemented with looping and DosSleep.
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| 6 | Therefore, they should be used only if a collision is very
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| 7 | unlikely, for instance, during initializing. In all other cases,
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| 8 | _fmutex or HMTX semaphores should be used. */
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| 9 |
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| 10 | #ifndef _SYS_SMUTEX_H
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| 11 | #define _SYS_SMUTEX_H
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| 12 |
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| 13 | #include <sys/builtin.h>
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| 14 |
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| 15 | #if defined (__cplusplus)
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| 16 | extern "C" {
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| 17 | #endif
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| 18 |
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| 19 | typedef signed char _smutex;
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| 20 |
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| 21 |
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| 22 | void __smutex_request_internal (__volatile__ _smutex *);
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| 23 |
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| 24 |
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| 25 | static __inline__ void _smutex_request (__volatile__ _smutex *sem)
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| 26 | {
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| 27 | if (__cxchg (sem, 1) != 0)
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| 28 | __smutex_request_internal (sem);
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| 29 | }
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| 30 |
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| 31 | static __inline__ int _smutex_try_request (__volatile__ _smutex *sem)
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| 32 | {
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| 33 | return __cxchg (sem, 1) == 0;
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| 34 | }
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| 35 |
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| 36 |
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| 37 | static __inline__ void _smutex_release (__volatile__ _smutex *sem)
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| 38 | {
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| 39 | *sem = 0;
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| 40 | }
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| 41 |
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| 42 |
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| 43 | static __inline__ int _smutex_available (__volatile__ _smutex *sem)
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| 44 | {
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| 45 | return *sem == 0;
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| 46 | }
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| 47 |
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| 48 |
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| 49 | #if defined (__cplusplus)
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| 50 | }
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| 51 | #endif
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| 52 |
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| 53 | #endif /* not _SYS_SMUTEX_H */
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