#! ./tesh

$ $SG_TEST_EXENV ${bindir:=.}/s4u_mutex
>[Tremblay:worker:(0) 0.000080] [s4u_test/INFO] Hello s4u, I'm ready to compute
>[Tremblay:worker:(0) 0.000080] [s4u_test/INFO] I'm done, good bye
>[Tremblay:worker:(0) 0.000080] [s4u_test/INFO] Hello s4u, I'm ready to compute
>[Tremblay:worker:(0) 0.000080] [s4u_test/INFO] I'm done, good bye
>[Jupiter:worker:(0) 0.000160] [s4u_test/INFO] Hello s4u, I'm ready to compute
>[Jupiter:worker:(0) 0.000160] [s4u_test/INFO] I'm done, good bye
>[Jupiter:worker:(0) 0.000160] [s4u_test/INFO] Hello s4u, I'm ready to compute
>[Jupiter:worker:(0) 0.000160] [s4u_test/INFO] I'm done, good bye
>[Tremblay:main:(0) 10.000000] [s4u_test/INFO] Results is -> 4