[distcc] cygwin port (distcc V1.1) using native win32 mutexes

[Heiko Elger]

Hello,

cause cygwin doesn't support advisory file locking
http://cygwin.com/ml/cygwin/2003-01/msg00674.html I do a port
in using native mutexes for syncronisation.
I use native win32 mutexes cause I don't no much about in using posix
syncronisation objects.

Perhaps this code cae be includes in the distribution.


--------------------------- snip - snip ------------------------------
63a64,69
> #if defined(__CYGWIN__)
> /* if not defined there were errors while including sub headerfiles */
> #   define WIN32_LEAN_AND_MEAN
> #   include <w32api/windows.h>
> #endif
>
66a73
>
87a95,117
>
> #if defined(__CYGWIN__)
> /* Convert error number to string */
> /* not reentrant ! */
> static const char* strLastError(DWORD err)
> {
>     static TCHAR msgBuf[100];
>     if (!FormatMessage(
>         FORMAT_MESSAGE_FROM_SYSTEM |
>         FORMAT_MESSAGE_IGNORE_INSERTS,
>         NULL,
>         err,
>         MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
>         (LPTSTR) &msgBuf[0],
>         sizeof(msgBuf)/sizeof(msgBuf[0]),
>         NULL ))
>     {
>         msgBuf[0]='\0';
>     }
>     return (char*)&msgBuf[0];
> }
> #endif
>
113a144,155
> #if defined(__CYGWIN__)
>     /****
>     * we have not to Release() the mutex, cause the system release it,
when the
>     * process terminates or is killed
>     *
>     * the same behavior as using file handles (original code)
>     *****/
>     HANDLE h=(HANDLE)fd;
>     DWORD  rc;
>     rc = WaitForSingleObject(h, block ? INFINITE : 0);
>     return rc;
> #else
129a172
> #endif
142c185,214
<
---
> #if defined(__CYGWIN__)
>     {
>         HANDLE h;
>         DWORD  lastError;
>         h = CreateMutex(NULL, FALSE, fname);
>         if (NULL==h)
>         {
>               rs_log_error("failed to creat %s: %s", fname,
strLastError(GetLastError()));
>               goto bomb;
>         }
>         ret = sys_lock((int)h, block);
>         lastError = GetLastError();
>         switch (ret)
>         {
>             case WAIT_OBJECT_0: /* Locked OK */
>             /* fall through */
>             case WAIT_ABANDONED: /* other process ends, killed or
terminated -> I got lock */
>                 rs_trace("locked %s", fname);
>                 free(fname);
>                 return 0;
>                 break;
>             case WAIT_TIMEOUT: /* Timeout */
>                 rs_trace("%s already locked", fname);
>                 break;
>             case WAIT_FAILED:  /* unknown error */
>             default:
>                  rs_log_error("lock(%lu) %s failed: %s", lastError, fname,
strLastError(lastError));
>         }
>     }
> #else
168c240
<             rs_log_error("lock %s failed: %s", fname, strerror(errno));
---
>             rs_log_error("lock(%d) %s failed: %s", errno, fname,
strerror(errno));
171c243
<
---
> #endif
176a249
>
--------------------------- snip - snip ------------------------------


Let me know if you like it or if you have any other comments,
suggestions, or fixes.

best regards .....


Heiko Elger