add mutex.Mutex

R=r
DELTA=349  (348 added, 0 deleted, 1 changed)
OCL=20380
CL=20472
10 files changed
tree: ec0ffdfb73b32bedaed4f9f6e830f1368267e9c2
  1. doc/
  2. include/
  3. lib/
  4. pkg/
  5. src/
  6. test/
  7. usr/