merge abstraction for POSIX Threads and integration changes (Michael Plante, Peter Stuge)r169

v1.0.6 release

Darwin: support multiple calls to libusb_init
Credit to Orin Eman for finding this bug.

Darwin: use logging functions
Use usbi_warn, usbi_err, and usbi_info instead of _usbi_log.

Darwin: fix memory leak in process_device
Credit to Mike Colagrosso for finding this bug.

Add internal abstraction for POSIX Threads
This prepares for a Windows backend without dependency on pthreads-w32.

pthread_* is renamed to usbi_* and PTHREAD_* to USBI_*.

A usbi_mutex_static_t and usbi_mutex_static_lock() and _unlock() are
introduced for statically initialized mutexes, since they may be
implemented using other types when pthreads mutexes aren't used.

Move -pthread from libusb/Makefile.am to host-specific AM_CFLAGS in
configure.ac. AM_CFLAGS is already used in Makefile.am.

(Numerous merge conflicts resolved by Michael Plante)

misc fixes to pthreads abstraction
* windows_compat.h should not be directly included (use libusbi.h)
* windows_usb.c still had some references to pthread_mutex_[un]lock

Add libusb_strerror() to get short error message in English from enum
(Merge conflicts resolved by Michael Plante)

Better cleanup on errors, stricter types and some good casts
Avoid various memory leaks in error code paths and remove warnings. Also
add usbi_cond_destroy in os/threads_posix.h because it's used for cleanup
now.

(Merge conflicts resolved by Michael Plante)

Rename all interface parameters to usb_interface or interface_number
(Merge conflicts resolved by Michael Plante)

Add type parameter to the list_for_each_entry() and _safe() macros
(Merge conflicts resolved by Michael Plante)

VA_ARGS workaround for logging with MSVC6
(Merge conflicts resolved by Michael Plante)

Fix context memory leak in libusb_init()
* Now holds default_context_lock for duration of libusb_init
* Doesn't allocate it if not needed

Fix the last MSVC /W3 warning

removal of pthreads from MSVC and mingw
* removed pthread*.lib from linking in msvc6 (2005/8 not yet edited)
* added threads_windows.[ch] to all project files in msvc6
* added usbi_cond_signal to both threading versions, unused
* added native windows threading code, now used

removed redundant time.h includes

removed pthread-win32 informational solution files

updated MSVC 2005/2008 for thread abstraction

fixed DDK build

fixed cygwin's use of POSIX threads

fixed dpfp/dpfp_threaded for MinGW compatibility

config_msvc.h -> msvc/config.h

pthread abstraction for DLL project files

fixed bad reference to thread_windows in 2005 DLL vcproj

cygwin ifdef is not required in threads_windows.h - removed

fixed residuals from previous patches

moved thread source detection into autotool scripts

3 files changed, 43 insertions, 434 deletions

diff --git a/msvc/config.h b/msvc/config.h
new file mode 100644
index 0000000..be1742c
--- /dev/null
+++ b/msvc/config.h
@@ -0,0 +1,43 @@
+/* config_msvc.h.  Manual config.h for MSVC.  */
+
+/* Default visibility */
+#define API_EXPORTED /**/
+
+/* Debug message logging */
+#define ENABLE_DEBUG_LOGGING 1
+
+/* Message logging */
+#define ENABLE_LOGGING 1
+
+/* Windows backend */
+#define OS_WINDOWS /**/
+
+/* Name of package */
+#define PACKAGE "libusb"
+
+/* Define to the address where bug reports for this package should be sent. */
+#define PACKAGE_BUGREPORT ""
+
+/* Define to the full name of this package. */
+#define PACKAGE_NAME "libusb"
+
+/* Define to the full name and version of this package. */
+#define PACKAGE_STRING "libusb 1.0.5"
+
+/* Define to the one symbol short name of this package. */
+#define PACKAGE_TARNAME "libusb"
+
+/* Define to the version of this package. */
+#define PACKAGE_VERSION "1.0.5"
+
+/* Define to 1 if you have the ANSI C header files. */
+#define STDC_HEADERS 1
+
+/* Backend handles timeout */
+/* #undef USBI_OS_HANDLES_TIMEOUT */
+
+/* timerfd headers available */
+/* #undef USBI_TIMERFD_AVAILABLE */
+
+/* Version number of package */
+#define VERSION "1.0.5"
diff --git a/msvc/pthread-win32_x64/pthread-win32.sln b/msvc/pthread-win32_x64/pthread-win32.sln
deleted file mode 100644
index 843252f..0000000
--- a/msvc/pthread-win32_x64/pthread-win32.sln
+++ /dev/null
@@ -1,25 +0,0 @@
-Microsoft Visual Studio Solution File, Format Version 9.00
-# Visual Studio 2005
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "pthread-win32", "pthread-win32.vcproj", "{E97509CF-6701-4526-8FCC-CC290C52E785}"
-EndProject
-Global
-	GlobalSection(SolutionConfigurationPlatforms) = preSolution
-		Debug|Win32 = Debug|Win32
-		Debug|x64 = Debug|x64
-		Release|Win32 = Release|Win32
-		Release|x64 = Release|x64
-	EndGlobalSection
-	GlobalSection(ProjectConfigurationPlatforms) = postSolution
-		{E97509CF-6701-4526-8FCC-CC290C52E785}.Debug|Win32.ActiveCfg = Debug|Win32
-		{E97509CF-6701-4526-8FCC-CC290C52E785}.Debug|Win32.Build.0 = Debug|Win32
-		{E97509CF-6701-4526-8FCC-CC290C52E785}.Debug|x64.ActiveCfg = Debug|x64
-		{E97509CF-6701-4526-8FCC-CC290C52E785}.Debug|x64.Build.0 = Debug|x64
-		{E97509CF-6701-4526-8FCC-CC290C52E785}.Release|Win32.ActiveCfg = Release|Win32
-		{E97509CF-6701-4526-8FCC-CC290C52E785}.Release|Win32.Build.0 = Release|Win32
-		{E97509CF-6701-4526-8FCC-CC290C52E785}.Release|x64.ActiveCfg = Release|x64
-		{E97509CF-6701-4526-8FCC-CC290C52E785}.Release|x64.Build.0 = Release|x64
-	EndGlobalSection
-	GlobalSection(SolutionProperties) = preSolution
-		HideSolutionNode = FALSE
-	EndGlobalSection
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diff --git a/msvc/pthread-win32_x64/pthread-win32.vcproj b/msvc/pthread-win32_x64/pthread-win32.vcproj
deleted file mode 100644
index b0be80d..0000000
--- a/msvc/pthread-win32_x64/pthread-win32.vcproj
+++ /dev/null
@@ -1,409 +0,0 @@
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-	<Platforms>
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