[patch] fix running growisofs on thread stack fatty systems

[Mike Frysinger]

Some systems (like PowerPC) cannot work with 64k thread stacks.  Setting the 
stack lower will error and the whole process aborts.  An example error:
$ growisofs -dvd-compat -Z /dev/hda=my.iso
Executing 'builtin_dd if=my.iso of=/dev/hda obs=32k seek=0'
:-( failed to create thread: Input/output error

So if the minimum required size is larger than 64k, we'll just use whatever 
the system defines.  If it is smaller, we'll stick with 64k.

Signed-off-by: Mike Frysinger <[EMAIL PROTECTED]>

--- dvd+rw-tools-7.0/mp.h
+++ dvd+rw-tools-7.0/mp.h
@@ -31,6 +31,16 @@
 #include <sched.h>
 #include <semaphore.h>
 #include <stdlib.h>
+#include <limits.h>
+
+/* some systems (like powerpc) cannot work with 64k stacks */
+#define MY_STACK_SIZE 64*1024
+#ifdef PTHREAD_STACK_MIN
+# if MY_STACK_SIZE < PTHREAD_STACK_MIN
+#  undef MY_STACK_SIZE
+#  define MY_STACK_SIZE PTHREAD_STACK_MIN
+# endif
+#endif
 
 #define THR_TYPE int
 
@@ -39,7 +49,7 @@
   pthread_attr_t attr;
 
     if (pthread_attr_init(&attr)==0 &&
-       pthread_attr_setstacksize(&attr,64*1024)==0 &&
+       pthread_attr_setstacksize(&attr,MY_STACK_SIZE)==0 &&
        pthread_attr_setscope(&attr,PTHREAD_SCOPE_SYSTEM)==0 &&
        pthread_create(&h,&attr,(void *(*)(void *))func,arg)==0 )
        return (void *)h;

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