Add function to get the id of the current thread

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/ec/trunk@38989 72102866-910b-0410-8b05-ffd578937521

EcProcess.h

@@ -171,6 +171,11 @@ extern NSString*	cmdLogName();
 extern NSString*	cmdLogFormat(EcLogType t, NSString *fmt);
 extern void             ecSetLogsSubdirectory(NSString *pathComponent);
 
+/** Return the native thread ID of the current thread, or NSNotFound if
+ * that is not available.
+ */
+extern NSUInteger       ecNativeThreadID();
+
 /* Set/get version/compilation date.
  */
 extern NSString*	cmdVersion(NSString *ver);

EcProcess.m

@@ -84,6 +84,13 @@
 #ifdef	HAVE_SYS_RESOURCE_H
 #include <sys/resource.h>
 #endif
+
+#if defined(HAVE_GETTID)
+#  include <unistd.h>
+#  include <sys/syscall.h>
+#  include <sys/types.h>
+#endif
+
 #include <stdio.h>
 
 
@@ -98,6 +105,17 @@
 #define	EC_EFFECTIVE_USER nil
 #endif
 
+NSUInteger
+ecNativeThreadID()
+{
+#if defined(__MINGW__)
+  return (NSUInteger)GetCurrentThreadId();
+#elif defined(HAVE_GETTID)
+  return (NSUInteger)syscall(SYS_gettid);
+#else
+  return NSNotFound;
+#endif
+}
 
 @interface      EcDefaultRegistration : NSObject
 {

config.h.in

@@ -16,6 +16,9 @@
 /* Define to 1 if you have the `getpid' function. */
 #undef HAVE_GETPID
 
+/* Define if you have gettid() */
+#undef HAVE_GETTID
+
 /* Define to 1 if you have the <inttypes.h> header file. */
 #undef HAVE_INTTYPES_H
 
@@ -97,6 +100,9 @@
 /* Define to the one symbol short name of this package. */
 #undef PACKAGE_TARNAME
 
+/* Define to the home page for this package. */
+#undef PACKAGE_URL
+
 /* Define to the version of this package. */
 #undef PACKAGE_VERSION
 

configure.ac

@@ -23,6 +23,18 @@ AC_CHECK_FUNCS(getpid setpgid)
 
 AC_CHECK_LIB([malloc],[mallinfo])
 
+AC_CACHE_CHECK([for gettid()], ac_cv_gettid,
+[AC_TRY_RUN(#define _GNU_SOURCE
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+int main(int argc, char **argv) {
+pid_t t = syscall(SYS_gettid); return t == -1 ? 1 : 0; },
+[ac_cv_gettid=yes], [ac_cv_gettid=no], [ac_cv_gettid=no])])
+if test "$ac_cv_gettid" = "yes"; then
+  AC_DEFINE(HAVE_GETTID, 1, [Define if you have gettid()])
+fi
+
 AC_ARG_WITH([readline],
   [AS_HELP_STRING([--with-readline],
     [support fancy command line editing @<:@default=check@:>@])],