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libblockdriver: allow for mixed sync/async replies

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This commit is contained in:
David van Moolenbroek 2011-11-30 19:07:04 +01:00
parent db087efac4
commit 8a0b9de41a
1 changed files with 6 additions and 2 deletions
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8
lib/libblockdriver/driver.c
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@ -146,11 +146,15 @@ PUBLIC void blockdriver_reply(message *m_ptr, int ipc_status, int reply)
m_ptr->BDEV_STATUS = reply;
m_ptr->BDEV_ID = id;
/* If we would block sending the message, send it asynchronously. */
/* If we would block sending the message, send it asynchronously. The NOREPLY
* flag is set because the caller may also issue a SENDREC (mixing sync and
* async comm), and the asynchronous reply could otherwise end up satisfying
* the SENDREC's receive part, after which our next SENDNB call would fail.
*/
if (IPC_STATUS_CALL(ipc_status) == SENDREC)
r = sendnb(caller_e, m_ptr);
else
r = asynsend(caller_e, m_ptr);
r = asynsend3(caller_e, m_ptr, AMF_NOREPLY);
if (r != OK)
printf("blockdriver_reply: unable to send reply to %d: %d\n",