Merge pull request #752 from rainers/gc_nothrow3

make most GC functions nothrow

src/core/runtime.d

@@ -359,7 +359,7 @@ extern (C) bool runModuleUnitTests()
     {
         import core.sys.posix.signal; // segv handler
 
-        static extern (C) void unittestSegvHandler( int signum, siginfo_t* info, void* ptr )
+        static extern (C) void unittestSegvHandler( int signum, siginfo_t* info, void* ptr ) nothrow
         {
             static enum MAXFRAMES = 128;
             void*[MAXFRAMES]  callstack;

src/core/sync/mutex.d

@@ -129,6 +129,15 @@ class Mutex :
      *  SyncException on error.
      */
     @trusted void lock()
+    {
+        lock_impl!SyncException();
+    }
+
+    @trusted void lock_nothrow() nothrow
+    {
+        lock_impl!Error();
+    }
+    private @trusted void lock_impl(Exc)()
     {
         version( Windows )
         {
@@ -138,11 +147,10 @@ class Mutex :
         {
             int rc = pthread_mutex_lock( &m_hndl );
             if( rc )
-                throw new SyncException( "Unable to lock mutex" );
+                throw new Exc( "Unable to lock mutex" );
         }
     }
 
-
     /**
      * Decrements the internal lock count by one.  If this brings the count to
      * zero, the lock is released.
@@ -151,6 +159,16 @@ class Mutex :
      *  SyncException on error.
      */
     @trusted void unlock()
+    {
+        unlock_impl!SyncException();
+    }
+
+    @trusted void unlock_nothrow() nothrow
+    {
+        unlock_impl!Error();
+    }
+
+    private @trusted void unlock_impl(Exc)()
     {
         version( Windows )
         {
@@ -160,11 +178,10 @@ class Mutex :
         {
             int rc = pthread_mutex_unlock( &m_hndl );
             if( rc )
-                throw new SyncException( "Unable to unlock mutex" );
+                throw new Exc( "Unable to unlock mutex" );
         }
     }
 
-
     /**
      * If the lock is held by another caller, the method returns.  Otherwise,
      * the lock is acquired if it is not already held, and then the internal

src/core/sys/freebsd/dlfcn.d

@@ -11,6 +11,7 @@ public import core.sys.posix.dlfcn;
 
 version (FreeBSD):
 extern (C):
+nothrow:
 
 enum __BSD_VISIBLE = true;
 
@@ -86,7 +87,7 @@ static if (__BSD_VISIBLE)
 
 private template __externC(RT, P...)
 {
-    alias extern(C) RT function(P) __externC;
+    alias extern(C) RT function(P) nothrow __externC;
 }
 
 /* XSI functions first. */

src/core/sys/freebsd/execinfo.d

@@ -10,6 +10,7 @@ module core.sys.freebsd.execinfo;
 
 version (FreeBSD):
 extern (C):
+nothrow:
 
 import core.sys.freebsd.dlfcn;
 
@@ -41,7 +42,7 @@ extern (D) int backtrace(void** buffer, int size)
 
 extern (D) char** backtrace_symbols(const(void*)* buffer, int size)
 {
-    static void* realloc(void* p, size_t len)
+    static void* realloc(void* p, size_t len) nothrow
     {
         static import cstdlib=core.stdc.stdlib;
         auto res = cstdlib.realloc(p, len);

src/core/sys/linux/execinfo.d

@@ -9,6 +9,7 @@ module core.sys.linux.execinfo;
 
 version (linux):
 extern (C):
+nothrow:
 
 int backtrace(void** buffer, int size);
 char** backtrace_symbols(const(void*)* buffer, int size);

src/core/sys/osx/execinfo.d

@@ -9,6 +9,7 @@ module core.sys.osx.execinfo;
 
 version (OSX):
 extern (C):
+nothrow:
 
 int backtrace(void** buffer, int size);
 char** backtrace_symbols(const(void*)* buffer, int size);

src/core/sys/osx/mach/thread_act.d

@@ -15,6 +15,7 @@ module core.sys.osx.mach.thread_act;
 
 version (OSX):
 extern (C):
+nothrow:
 
 public import core.sys.osx.mach.kern_return;
 public import core.sys.osx.mach.port;

src/core/sys/osx/pthread.d

@@ -15,6 +15,7 @@ module core.sys.osx.pthread;
 
 version (OSX):
 extern (C):
+nothrow:
 
 public import core.sys.posix.pthread;
 public import core.sys.osx.mach.port;

src/core/sys/posix/dlfcn.d

@@ -18,6 +18,7 @@ private import core.sys.posix.config;
 
 version (Posix):
 extern (C):
+nothrow:
 
 //
 // XOpen (XSI)

src/core/sys/posix/semaphore.d

@@ -19,6 +19,7 @@ private import core.sys.posix.time;
 
 version (Posix):
 extern (C):
+nothrow:
 
 //
 // Required

src/core/sys/posix/signal.d

@@ -23,6 +23,7 @@ public import core.sys.posix.sys.types; // for pid_t
 
 version (Posix):
 extern (C):
+nothrow:
 
 //
 // Required
@@ -638,6 +639,7 @@ version( linux )
             } _sigpoll_t _sigpoll;
         } _sifields_t _sifields;
 
+    nothrow:
         @property ref pid_t si_pid() { return _sifields._kill.si_pid; }
         @property ref uid_t si_uid() { return _sifields._kill.si_uid; }
         @property ref void* si_addr() { return _sifields._sigfault.si_addr; }