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Diffstat (limited to 'manual/pthread_key_create.html')
| -rw-r--r-- | manual/pthread_key_create.html | 42 |
1 files changed, 28 insertions, 14 deletions
diff --git a/manual/pthread_key_create.html b/manual/pthread_key_create.html index 9d9e004..5ecca69 100644 --- a/manual/pthread_key_create.html +++ b/manual/pthread_key_create.html @@ -5,7 +5,7 @@ <TITLE>PTHREAD_SPECIFIC(3) manual page</TITLE> <META NAME="GENERATOR" CONTENT="OpenOffice.org 1.1.3 (Linux)"> <META NAME="CREATED" CONTENT="20050504;18425400"> - <META NAME="CHANGED" CONTENT="20050505;18330000"> + <META NAME="CHANGED" CONTENT="20050509;18220200"> <!-- manual page source format generated by PolyglotMan v3.2, --> <!-- available at http://polyglotman.sourceforge.net/ --> </HEAD> @@ -60,9 +60,9 @@ in all currently executing threads. a destructor function associated with the key. When a thread terminates via <B>pthread_exit</B> or by cancellation, <I>destr_function</I> is called with arguments the value associated with the key in that -thread. The <I>destr_function</I> is not called if that value is -<B>NULL</B>. The order in which destructor functions are called at -thread termination time is unspecified. +thread. The <I>destr_function</I> is not called if that value is <B>NULL</B><SPAN STYLE="font-weight: medium"> +or the key has been deleted</SPAN>. The order in which destructor +functions are called at thread termination time is unspecified. </P> <P>Before the destructor function is called, the <B>NULL</B> value is associated with the key in the current thread. A destructor function @@ -70,11 +70,7 @@ might, however, re-associate non- <B>NULL</B> values to that key or some other key. To deal with this, if after all the destructors have been called for all non- <B>NULL</B> values, there are still some non- <B>NULL</B> values with associated destructors, then the process -is repeated. The <B>Pthreads-w32</B> implementation stops the process after -<B>PTHREAD_DESTRUCTOR_ITERATIONS</B> iterations, even if some non- -<B>NULL</B> values with associated descriptors remain. Other -implementations may loop indefinitely. -</P> +is repeated.</P> <P><B>pthread_key_delete</B> deallocates a TSD key. It does not check whether non- <B>NULL</B> values are associated with that key in the currently executing threads, nor call the destructor function @@ -86,6 +82,24 @@ in the calling thread, storing the given <I>pointer</I> instead. <P><B>pthread_getspecific</B> returns the value currently associated with <I>key</I> in the calling thread. </P> +<P>The routines <B>pthread_setspecific</B>, <B>pthread_getspecific</B>, +and <B>pthread_key_delete</B> can be called from <I>destr_function</I> +targeting any valid key including the key on which <I>destr_function</I> +is currently operating. If <B>pthread_getspecific</B> is called on +the key whose thread specific data is being destroyed, the value NULL +is returned, unless <B>pthread_setspecific</B> was called previously +on that key from within <I>destr_function</I> to set the value to +non-NULL. For some implementations the effect of calling +<B>pthread_setspecific</B> from within <I>destr_function</I> can be +either memory leakage or infinite loops if <I>destr_function</I> has +already been called at least <B>PTHREAD_DESTRUCTOR_ITERATIONS</B> +times.</P> +<P STYLE="font-weight: medium"><B>Pthreads-w32</B> stops running key +<I>destr_function</I> routines after <B>PTHREAD_DESTRUCTOR_ITERATIONS</B> +iterations, even if some non- <B>NULL</B> values with associated +descriptors remain. If memory is allocated and associated with a key +from within <I>destr_function</I>, that memory may not be reclaimed +because that key's <I>destr_function</I>, may not run again.</P> <H2><A HREF="#toc3" NAME="sect3">Return Value</A></H2> <P><B>pthread_key_create</B>, <B>pthread_key_delete</B>, and <B>pthread_setspecific</B> return 0 on success and a non-zero error @@ -105,7 +119,7 @@ error: <DT STYLE="margin-right: 1cm; margin-bottom: 0.5cm"><B>EAGAIN</B> </DT></DL> </DL> -<BLOCKQUOTE STYLE="margin-left: 3cm"> +<BLOCKQUOTE STYLE="margin-left: 5cm"> <B>PTHREAD_KEYS_MAX</B> keys are already allocated </BLOCKQUOTE> <DL> @@ -113,7 +127,7 @@ error: <DT STYLE="margin-right: 1cm; margin-bottom: 0.5cm"><B>ENOMEM</B> </DT></DL> </DL> -<BLOCKQUOTE STYLE="margin-left: 3cm"> +<BLOCKQUOTE STYLE="margin-left: 5cm"> Insufficient memory to allocate the key. </BLOCKQUOTE> <P><B>pthread_key_delete</B> and <B>pthread_setspecific</B> return @@ -171,8 +185,8 @@ static void buffer_destroy(void * buf) free(buf); }</PRE> <HR> -<BLOCKQUOTE STYLE="margin-left: 0cm"><A NAME="toc"></A><B>Table of -Contents</B></BLOCKQUOTE> +<BLOCKQUOTE STYLE="margin-left: 0cm; margin-right: 0cm"><A NAME="toc"></A> +<B>Table of Contents</B></BLOCKQUOTE> <UL> <LI><BLOCKQUOTE STYLE="margin-bottom: 0cm"><A HREF="#sect0" NAME="toc0">Name</A> </BLOCKQUOTE> @@ -194,4 +208,4 @@ Contents</B></BLOCKQUOTE> </BLOCKQUOTE> </UL> </BODY> -</HTML> +</HTML>
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