release GIL during blocking visionipc calls

Author: deanlee

msgq/visionipc/visionipc.pxd

@@ -54,8 +54,8 @@ cdef extern from "msgq/visionipc/visionipc_client.h":
     int num_buffers
     VisionBuf buffers[1]
     VisionIpcClient(string, VisionStreamType, bool, void*, void*)
-    VisionBuf * recv(VisionIpcBufExtra *, int)
-    bool connect(bool)
+    VisionBuf * recv(VisionIpcBufExtra *, int) nogil
+    bool connect(bool) nogil
     bool is_connected()
     @staticmethod
     set[VisionStreamType] getAvailableStreams(string, bool)

msgq/visionipc/visionipc_pyx.pyx

@@ -152,13 +152,18 @@ cdef class VisionIpcClient:
     return self.extra.valid
 
   def recv(self, int timeout_ms=100):
-    buf = self.client.recv(&self.extra, timeout_ms)
+    cdef cppVisionBuf * buf
+    with nogil:
+      buf = self.client.recv(&self.extra, timeout_ms)
     if not buf:
       return None
     return VisionBuf.create(buf)
 
   def connect(self, bool blocking):
-    return self.client.connect(blocking)
+    cdef bool result
+    with nogil:
+      result = self.client.connect(blocking)
+    return result
 
   def is_connected(self):
     return self.client.is_connected()