Hi there,
the following shows a problem in Cygwin 1.7 that is not present in Cygwin 1.5:
roberto@sissi /tmp $ cat bug.c #include <sys/time.h> #include <time.h> #include <signal.h> #include <stdio.h>
volatile int alarm_called = 0;
void alarm(int sig) { alarm_called = 1; }
int main() { unsigned long i; struct itimerval it;
it.it_interval.tv_sec = 0; it.it_interval.tv_usec = 0;
/* 100,000 microseconds. */ it.it_value = (struct timeval) { 0, 100000 }; signal(SIGALRM, alarm);
setitimer(ITIMER_REAL, &it, (struct itimerval *) 0);
for (i = 0; i <= 2000000000; ++i) if (alarm_called) break;
if (alarm_called) printf("alarm() called\n"); else printf("alarm() NOT called\n");
return 0; }
roberto@sissi /tmp $ gcc -v Reading specs from /usr/lib/gcc/i686-pc-cygwin/3.4.4/specs Configured with: /usr/build/package/orig/test.respin/gcc-3.4.4-3/configure --verbose --prefix=/usr --exec-prefix=/usr --sysconfdir=/etc --libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info --enable-languages=c,ada,c++,d,f77,pascal,java,objc --enable-nls --without-included-gettext --enable-version-specific-runtime-libs --without-x --enable-libgcj --disable-java-awt --with-system-zlib --enable-interpreter --disable-libgcj-debug --enable-threads=posix --enable-java-gc=boehm --disable-win32-registry --enable-sjlj-exceptions --enable-hash-synchronization --enable-libstdcxx-debug Thread model: posix gcc version 3.4.4 (cygming special, gdc 0.12, using dmd 0.125)
roberto@sissi /tmp $ gcc bug.c
roberto@sissi /tmp $ time ./a.exe alarm() NOT called
real 0m7.203s user 0m7.201s sys 0m0.015s
roberto@sissi /tmp $
As you see, the alarm() function is not invoked as it should (and as it is in Cygwin 1.5). All the best,
Roberto