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Daniel Stenberg 2009-05-23 20:23:44 +00:00
parent 26028068e8
commit 8fc17ed764
2 changed files with 32 additions and 34 deletions
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31
ares/ares_library_cleanup.3
View File

@ -36,33 +36,32 @@ was initialized.
.PP
This function must be called when the program using c-ares will
no longer need any c-ares function. Once the program has called
ares_library_cleanup() it shall not make any further call to any
\fIares_library_cleanup(3)\fP it shall not make any further call to any
c-ares function.
.PP
This function does not cancel any pending c-ares lookups or requests
previously done. Program must use \fIares_cancel(3)\fP for this purpose.
.PP
.B This function is not thread safe.
You have to call it once the program
is about to terminate, but this call must be done once the program has
terminated every single thread that it could have initiated. This is
required to avoid potential race conditions in library deinitialization,
and also due to the fact that ares_library_cleanup() might call functions
from other libraries that are thread unsafe, and could conflict with any
other thread that is already using these other libraries.
You have to call it once the program is about to terminate, but this call must
be done once the program has terminated every single thread that it could have
initiated. This is required to avoid potential race conditions in library
deinitialization, and also due to the fact that \fIares_library_cleanup(3)\fP
might call functions from other libraries that are thread unsafe, and could
conflict with any other thread that is already using these other libraries.
.PP
Win32/64 application DLLs shall not call ares_library_cleanup() from the
DllMain function. Doing so will produce deadlocks and other problems.
Win32/64 application DLLs shall not call \fIares_library_cleanup(3)\fP from
the DllMain function. Doing so will produce deadlocks and other problems.
.SH NOTES
This function was first introduced in c-ares version 1.6.1 along with
the definition of preprocessor symbol \fICARES_HAVE_ARES_LIBRARY_CLEANUP\fP
as an indication of the availability of this function.
This function was first introduced in c-ares version 1.6.1 along with the
definition of preprocessor symbol \fICARES_HAVE_ARES_LIBRARY_CLEANUP\fP as an
indication of the availability of this function.
.PP
Since the introduction of this function, it is absolutely mandatory to
call it for any Win32/64 program using c-ares.
Since the introduction of this function, it is absolutely mandatory to call it
for any Win32/64 program using c-ares.
.PP
Non-Win32/64 systems can still use c-ares version 1.6.1 without calling
ares_library_cleanup() due to the fact that it is nearly a do-nothing
\fIares_library_cleanup(3)\fP due to the fact that it is nearly a do-nothing
function on non-Win32/64 platforms.
.SH SEE ALSO
.BR ares_library_init(3),

35
ares/ares_library_init.3
View File

@ -51,15 +51,14 @@ ORing the values together. In normal operation you should specify
familiar with it and trying to control some internal c-ares feature.
.PP
.B This function is not thread safe.
You have to call it once the program
has started, but this call must be done before the program starts any
other thread. This is required to avoid potential race conditions in
library initialization, and also due to the fact that ares_library_init()
might call functions from other libraries that are thread unsafe, and
could conflict with any other thread that is already using these other
libraries.
You have to call it once the program has started, but this call must be done
before the program starts any other thread. This is required to avoid
potential race conditions in library initialization, and also due to the fact
that \fIares_library_init(3)\fP might call functions from other libraries that
are thread unsafe, and could conflict with any other thread that is already
using these other libraries.
.PP
Win32/64 application DLLs shall not call ares_library_init() from the
Win32/64 application DLLs shall not call \fIares_library_init(3)\fP from the
DllMain function. Doing so will produce deadlocks and other problems.
.SH FLAGS
.TP 5
@ -72,21 +71,21 @@ Initialize Win32/64 specific libraries.
.B ARES_LIB_INIT_NONE
Initialize nothing extra. This sets no bit.
.SH RETURN VALUE
Upon successful completion, ares_library_init() will return 0.
Otherwise, a non-zero error number will be returned to indicate
the error. Except for \fIares_strerror(3)\fP, you shall not call any
other c-ares function upon ares_library_init() failure.
.SH NOTES
This function was first introduced in c-ares version 1.6.1 along with
the definition of preprocessor symbol \fICARES_HAVE_ARES_LIBRARY_INIT\fP
as an indication of the availability of this function.
Upon successful completion, ares_library_init() will return 0. Otherwise, a
non-zero error number will be returned to indicate the error. Except for
\fIares_strerror(3)\fP, you shall not call any other c-ares function upon
\fIares_library_init(3)\fP failure.
.SH AVAILABILITY
This function was first introduced in c-ares version 1.6.1 along with the
definition of preprocessor symbol \fICARES_HAVE_ARES_LIBRARY_INIT\fP as an
indication of the availability of this function.
.PP
Since the introduction of this function it is absolutely mandatory to
call it for any Win32/64 program using c-ares.
.PP
Non-Win32/64 systems can still use c-ares version 1.6.1 without calling
ares_library_init() due to the fact that it is nearly a do-nothing
function on non-Win32/64 platforms.
\fIares_library_init(3)\fP due to the fact that it is nearly a do-nothing
function on non-Win32/64 platforms at this point.
.SH SEE ALSO
.BR ares_library_cleanup(3),
.BR ares_strerror(3)