core: Use gpgrt locking for thread safeness

* configure.ac: Require libgpg-error 1.17. No longer
check for pthread.
* doc/gpgme.texi: Document removed neccessity for thread
safe gpgme flavours.
* src/sema.h (DEFINE_GLOBAL_LOCK),
(DEFINE_STATIC_LOCK, INIT_LOCK, DECLARE_LOCK)
(DESTROY_LOCK, LOCK, UNLOCK): Change to gpgrt equivalents.
* src/posix-sema.c, src/w32-sema.c: Removed.
* src/Makefile.am: Remove libpthread and
Update accordingly.
* src/ath.c, src/ath.h (ath_mutex_init)
(ath_mutex_destroy, ath_mutex_lock, ath_mutex_unlock): Removed.
* src/ath.h (ATH_MUTEX_INITIALIZER): Removed.
* src/version.c (do_subsystem_inits): sema_subsystem_init is
no longer required.
* tests/gpg/Makefile.am: Add new threading tests.
(t_thread1_LDADD, t_cancel_LDADD):
Use just gpgme.
* tests/gpg/t-thread-keylist-verify.c,
tests/gpg/t-thread-keylist.c: New.
* src/gpgme-config.in: Use -lgpgme for thread-model pthread.

--
Using gpgrt locks instead of pthread locks removes
the neccessity to link pthread directly to gpgme and
have a different, thread safe flavor of gpgme. Now
gpgme is thread-safe if the conditions mentioned
in the doc are met.

As the cpp bindings linked against libgpgme
and not libgpgme-pthread this fixes threading problems
with them.

libgpgme-pthread is removed but gpgme-config still supports
--thread=pthread for compatibility with find scripts.

1 files changed, 6 insertions, 30 deletions

diff --git a/doc/gpgme.texi b/doc/gpgme.texi
index a70418db..42c16a89 100644
--- a/doc/gpgme.texi
+++ b/doc/gpgme.texi
@@ -458,12 +458,6 @@ specifying both options to @command{gpgme-config}:
 gcc -o foo foo.c `gpgme-config --cflags --libs`
 @end example
 
-If you want to link to one of the thread-safe versions of
-@acronym{GPGME}, you must specify the @option{--thread} option before
-any other option to select the thread package you want to link with.
-Supported thread packages are @option{--thread=pth} and
-@option{--thread=pthread}.
-
 If you need to detect the installed language bindings you can use list
 them using:
 
@@ -614,7 +608,9 @@ that can be used with GNU Pth, and defines @code{GPGME_PTH_CFLAGS} and
 
 @code{AM_PATH_GPGME_PTHREAD} checks for the version of @acronym{GPGME}
 that can be used with the native pthread implementation, and defines
-@code{GPGME_PTHREAD_CFLAGS} and @code{GPGME_PTHREAD_LIBS}.
+@code{GPGME_PTHREAD_CFLAGS} and @code{GPGME_PTHREAD_LIBS}. Since
+version 1.8.0 this is no longer required to GPGME_PTHREAD as
+@acronym{GPGME} itself is thread safe.
 
 This macro searches for @command{gpgme-config} along the PATH.  If
 you are cross-compiling, it is useful to set the environment variable
@@ -814,32 +810,12 @@ application is multi-threaded, and you install a signal action for
 @cindex thread-safeness
 @cindex multi-threading
 
-The @acronym{GPGME} library is not entirely thread-safe, but it can
-still be used in a multi-threaded environment if some care is taken.
-If the following requirements are met, there should be no race
-conditions to worry about:
+The @acronym{GPGME} library is mostly thread-safe, an can be used
+in a mulithreaded environment but there are some requirements
+for mutlithreaded use:
 
 @itemize @bullet
 @item
-@acronym{GPGME} supports the thread libraries pthread and GNU Pth.
-The support for this has to be enabled at compile time.
-@acronym{GPGME} will automatically detect the location in which the
-thread libraries are installed and activate the support for them at
-build time.
-
-Support for other thread libraries is very easy to add.  Please
-contact us if you have the need.
-
-@item
-If you want to use @acronym{GPGME} with threads, you must link to the
-right version of the library.  The name of the right library is
-@code{libgpgme-} followed by the name of the thread package you use.
-For example, if you use GNU Pth, the right name is
-@code{libgpgme-pth}.  Use the Automake macros or
-@command{gpgme-config} program for simplicity.
-
-
-@item
 The function @code{gpgme_check_version} must be called before any
 other function in the library, because it initializes the thread
 support subsystem in @acronym{GPGME}.  To achieve this in