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ipc: Fix in_handles handling by syncing with the server

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Jakob Bornecrantz 2020-07-20 12:44:14 +01:00 committed by Jakob Bornecrantz
parent a41c1ce1c5
commit 9c490127bb
1 changed files with 37 additions and 1 deletions
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38
src/xrt/ipc/proto.py
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@ -135,6 +135,8 @@ def generate_client_c(file, p):
f.write("\tstruct ipc_" + call.name + "_reply _reply;\n")
else:
f.write("\tstruct ipc_result_reply _reply = {0};\n")
if call.in_handles:
f.write("\tstruct ipc_result_reply _sync = {0};\n")
f.write("""
\t// Other threads must not read/write the fd while we wait for reply
@ -151,9 +153,25 @@ def generate_client_c(file, p):
write_result_handler(f, 'ret', cleanup, indent="\t")
if call.in_handles:
f.write("\n\t// Send our handles separately\n")
f.write("\n\t// Wait for server sync")
# Must sync with the server so it's expecting the next message.
write_invocation(
f,
'ret',
'ipc_receive',
(
'&ipc_c->imc',
'&_sync',
'sizeof(_sync)'
),
indent="\t"
)
f.write(';')
write_result_handler(f, 'ret', cleanup, indent="\t")
# Must send these in a second message
# since the server doesn't know how many to expect.
f.write("\n\t// Send our handles separately\n")
f.write("\n\t// We need this message data as filler only\n")
f.write("\tstruct ipc_command_msg _handle_msg = {\n")
f.write("\t .cmd = " + str(call.id) + ",\n")
@ -254,6 +272,8 @@ ipc_dispatch(volatile struct ipc_client_state *ics, ipc_command_t *ipc_command)
f.write("\t\tstruct ipc_%s_reply reply = {0};\n" % call.name)
else:
f.write("\t\tstruct ipc_result_reply reply = {0};\n")
if call.in_handles:
f.write("\tstruct ipc_result_reply _sync = {XRT_SUCCESS};\n")
if call.out_handles:
f.write("\t\t%s %s[MAX_HANDLES] = {0};\n" % (
call.out_handles.typename, call.out_handles.arg_name))
@ -267,6 +287,22 @@ ipc_dispatch(volatile struct ipc_client_state *ics, ipc_command_t *ipc_command)
f.write("\t\t%s in_%s[MAX_HANDLES] = {0};\n" % (
call.in_handles.typename, call.in_handles.arg_name))
f.write("\t\tstruct ipc_command_msg _handle_msg = {0};\n")
# Let the client know we are ready to receive the handles.
write_invocation(
f,
'xrt_result_t sync_result',
'ipc_send',
(
"(struct ipc_message_channel *)&ics->imc",
"&_sync",
"sizeof(_sync)"
),
indent="\t\t"
)
f.write(";")
write_result_handler(f, "sync_result",
indent="\t\t")
write_invocation(
f,
'xrt_result_t receive_handle_result',