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239c2bf93e
* libc/misc/unctrl.c: Replace FUNCTION description.
* libc/signal/signal.c: Remove documentation for raise and _raise_r.
* libc/stdio/getdelim.c: Fix spelling errors.
* libc/stdio/getw.c: Put RETURNS on a separate line. Fix punctuation.
* libc/stdio/putw.c: Likewise.
* libc/stdlib/a64l.c: Fix formatting, spelling and punctuation in
documentation.
* libc/stdlib/assert.c: Do not capitalize FUNCTION description.
* libc/stdlib/efgcvt.c: Add spaces to FUNCTION description.
* libc/stdlib/envlock.c: Use em-dash in FUNCTION description.
* libc/stdlib/mlock.c: Likewise.
* libc/stdlib/mstats.c: Likewise.
* libc/time/tzlock.c: Likewise.
* libc/stdlib/rand.c: Use "multi-threaded" and "thread-safe" in NOTES.
* libc/stdlib/rand48.c: Remove extra space in FUNCTION description
and hyphenate "pseudo-random".
* libc/string/bcmp.c: Remove extra blank lines in documentation.
* libc/string/strncat.c: Likewise.
* libc/string/memchr.c: Remove extra ">" character in documentation.
* libc/string/strcspn.c: Use "characters" instead of "chars".
* libc/string/strpbrk.c: Likewise.
* libc/string/strerror_r.c: Capitalize "GNU".
* libc/string/strnlen.c: Likewise.
* libc/string/strtok.c: Fix formatting, spelling and punctuation in
documentation. Use "multi-threaded" and "thread-safe" in NOTES.
* libc/string/wcscat.c: Split PORTABILITY into two paragraphs.
* libc/string/wcschr.c: Likewise.
* libc/string/wcscmp.c: Likewise.
* libc/string/wcscpy.c: Likewise.
* libc/string/wcscspn.c: Likewise.
* libc/string/wcslen.c: Likewise.
* libc/string/wcsncat.c: Likewise.
* libc/string/wcsncmp.c: Likewise.
* libc/string/wcsncpy.c: Likewise.
* libc/string/wcsnlen.c: Likewise.
* libc/string/wcspbrk.c: Likewise.
* libc/string/wcsrchr.c: Likewise.
* libc/string/wcsspn.c: Likewise.
* libc/string/wmemchr.c: Likewise.
* libc/string/wmemcmp.c: Likewise.
* libc/string/wmemcpy.c: Likewise.
* libc/string/wmemset.c: Likewise.
* libc/string/wmemmove.c: Likewise. Also fix FUNCTION description.
* libc/string/wcswidth.c: Formatting and punctuation in documentation.
* libc/string/wcwidth.c: Likewise.
* libm/common/s_modf.c: Remove extra period from documentation.
* libm/math/s_isnan.c: Fix formatting, grammar and punctuation in
documentation.
* libm/mathfp/s_isnan.c: Likewise.
* libm/math/s_ldexp.c: Fix punctuation.
* libm/mathfp/s_ldexp.c: Likewise.
* libm/math/w_log.c: Likewise.
* libm/mathfp/s_logarithm.c: Likewise.
* libm/math/w_j0.c: Add spaces to FUNCTION description.
* libm/mathfp/w_jn.c: Likewise.
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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