| PMISSENDSTABLE(3) | PMISSENDSTABLE(3) | 
int pmIsSendStable(pmContext *pmc);
| pmContext * | pmc | pmContextobject | 
pmIsSendStable() determines if the context is stable.
Stable means there is no message waiting for an acknowlege, and no
acknowleges to be sent.
| PM_SUCCESS | Context is stable | 
| EBUSY | Context is not stable |