SIG_UNBLOCK       124 native_client_sdk/src/libraries/third_party/newlib-extras/sys/signal.h #define SIG_UNBLOCK 2	/* set of signals to, well, unblock */
SIG_UNBLOCK       332 native_client_sdk/src/libraries/third_party/pthreads-win32/pthread.h #define SIG_UNBLOCK 1