Backported from 7.5, although slightly less strict: Better checking of error return codes from various thread functions. Added -dT argument to enable error checking mutexes in the thread library (--with-rtldebug is _not_ required). Rev: man/pike.1:1.12 Rev: src/acconfig.h:1.80 Rev: src/configure.in:1.500 Rev: src/main.c:1.116 Rev: src/main.h:1.16 Rev: src/threads.c:1.169 Rev: src/threads.h:1.119