Infrastructure Software

Hello,
I have a program which calls nanosleep many times and sometimes hangs on an x86 box running

[appn1:root] / $ uname -a
SunOS appn1 5.10 Generic_137112-08 i86pc i386 i86pc

while running fine on

SunOS sun03 5.10 Generic_127128-11 i86pc i386 i86pc

Here is the code boiled down to a minimum:

#include <stdio.h>
#include <time.h>
#include <errno.h>
#include <strings.h>

#define DELAY 1000000

int main()
{
   struct timespec req;
   req.tv_sec = 0;
   req.tv_nsec = 1;
   
   for (;;)
   {
      for (int i=0; i<DELAY; ++i)
         if (nanosleep(&req,NULL) < 0)
            perror("Squeak");
      printf("Tick\n");
   }
}

pstack shows the hang is happening in the nanosleep itself:

[appn1:root] / $ pstack 25221
25221:  dodgysleep
 fed64aa7 nanosleep (8047e0c, 0)
 fef92b67 nanosleep (8047e0c, 0) + 1b
 080509f0 main     (1, 8047e44, 8047e4c, 8050898) + 30
 0805092d _start   (1, 8047ef0, 0, 8047efb, 8047f07, 8047f0e) + 7d
[appn1:root] / $ 

Am I doing something silly? Does anybody know what is going on?

Thanks
-- Steve