Last change
on this file since 444 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
1.2 KB
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Rev | Line | |
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[444] | 1 | /* |
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| 2 | FUNCTION |
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| 3 | <<__tz_lock>>, <<__tz_unlock>>---lock time zone global variables |
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| 4 | |
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| 5 | INDEX |
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| 6 | __tz_lock |
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| 7 | INDEX |
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| 8 | __tz_unlock |
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| 9 | |
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| 10 | SYNOPSIS |
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| 11 | #include "local.h" |
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| 12 | void __tz_lock (void); |
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| 13 | void __tz_unlock (void); |
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| 14 | |
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| 15 | DESCRIPTION |
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| 16 | The <<tzset>> facility functions call these functions when they need to |
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| 17 | ensure the values of global variables. The version of these routines |
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| 18 | supplied in the library use the lock API defined in sys/lock.h. If multiple |
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| 19 | threads of execution can call the time functions and give up scheduling in |
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| 20 | the middle, then you you need to define your own versions of these functions |
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| 21 | in order to safely lock the time zone variables during a call. If you do |
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| 22 | not, the results of <<localtime>>, <<mktime>>, <<ctime>>, and <<strftime>> |
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| 23 | are undefined. |
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| 24 | |
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| 25 | The lock <<__tz_lock>> may not be called recursively; that is, |
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| 26 | a call <<__tz_lock>> will always lock all subsequent <<__tz_lock>> calls |
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| 27 | until the corresponding <<__tz_unlock>> call on the same thread is made. |
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| 28 | */ |
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| 29 | |
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| 30 | #include <_ansi.h> |
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| 31 | #include "local.h" |
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| 32 | #include <sys/lock.h> |
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| 33 | |
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| 34 | #ifndef __SINGLE_THREAD__ |
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| 35 | __LOCK_INIT(static, __tz_mutex); |
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| 36 | #endif |
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| 37 | |
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| 38 | void |
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| 39 | __tz_lock (void) |
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| 40 | { |
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| 41 | #ifndef __SINGLE_THREAD__ |
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| 42 | __lock_acquire(__tz_mutex); |
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| 43 | #endif |
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| 44 | } |
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| 45 | |
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| 46 | void |
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| 47 | __tz_unlock (void) |
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| 48 | { |
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| 49 | #ifndef __SINGLE_THREAD__ |
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| 50 | __lock_release(__tz_mutex); |
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| 51 | #endif |
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| 52 | } |
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