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1dc1ccd4ae
* libc/stdio/diprintf.c: Modify documentation so eclipse newlib
libhover docs generate properly.
* libc/stdio/dprintf.c: Ditto.
* libc/stdio/fflush.c: Ditto.
* libc/stdio/fopencookie.c: Ditto.
* libc/stdio/fread.c: Ditto.
* libc/stdio/fsetpos.c: Ditto.
* libc/stdio/getc_u.c: Ditto.
* libc/stdio/getchar_u.c: Ditto.
* libc/stdio/putc_u.c: Ditto.
* libc/stdio/putchar_u.c: Ditto.
* libc/stdio/remove.c: Ditto.
* libc/stdio/siprintf.c: Ditto.
* libc/stdio/siscanf.c: Ditto.
* libc/stdio/sprintf.c: Ditto.
* libc/stdio/sscanf.c: Ditto.
* libc/stdio/vfprintf.c: Ditto.
* libc/stdio/vfscanf.c: Ditto.
* libc/stdio/viprintf.c: Ditto.
* libc/stdio/viscanf.c: Ditto.
* libc/stdlib/calloc.c: Ditto.
* libc/stdlib/efgcvt.c: Ditto.
* libc/stdlib/envlock.c: Ditto.
* libc/time/asctime.c: Ditto.
* libc/time/ctime.c: Ditto.
* libc/time/gmtime.c: Ditto.
* libc/time/lcltime.c: Ditto.
* libc/time/tzset.c: Ditto.
* libc/stdlib/envlock.h: Moved to libc/include.
62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
/*
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FUNCTION
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<<__env_lock>>, <<__env_unlock>>---lock environ variable
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INDEX
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__env_lock
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INDEX
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__env_unlock
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ANSI_SYNOPSIS
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#include <envlock.h>
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void __env_lock (struct _reent *<[reent]>);
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void __env_unlock (struct _reent *<[reent]>);
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TRAD_SYNOPSIS
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void __env_lock(<[reent]>)
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struct _reent *<[reent]>;
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void __env_unlock(<[reent]>)
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struct _reent *<[reent]>;
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DESCRIPTION
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The <<setenv>> family of routines call these functions when they need to
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modify the environ variable. The version of these routines supplied in the
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library use the lock API defined in sys/lock.h. If multiple threads of
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execution can call <<setenv>>, or if <<setenv>> can be called reentrantly,
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then you need to define your own versions of these functions in order to
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safely lock the memory pool during a call. If you do not, the memory pool
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may become corrupted.
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A call to <<setenv>> may call <<__env_lock>> recursively; that is,
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the sequence of calls may go <<__env_lock>>, <<__env_lock>>,
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<<__env_unlock>>, <<__env_unlock>>. Any implementation of these
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routines must be careful to avoid causing a thread to wait for a lock
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that it already holds.
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*/
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#include "envlock.h"
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#include <sys/lock.h>
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#ifndef __SINGLE_THREAD__
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__LOCK_INIT_RECURSIVE(static, __env_lock_object);
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#endif
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void
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__env_lock (ptr)
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struct _reent *ptr;
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{
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#ifndef __SINGLE_THREAD__
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__lock_acquire_recursive (__env_lock_object);
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#endif
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}
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void
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__env_unlock (ptr)
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struct _reent *ptr;
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{
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#ifndef __SINGLE_THREAD__
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__lock_release_recursive (__env_lock_object);
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#endif
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}
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