Add precompilation (#224)

* Add precompilation

On my machine this drops the time required for the "workload" from
about 0.25s to about 0.025s (factor of 10). While the absolute times
are not large, the aim is to reduce the startup time for IJulia kernels.

* Add [compat]

* fix indentation

Project.toml

@@ -4,10 +4,12 @@ version = "1.2.2"
 
 [deps]
 FileWatching = "7b1f6079-737a-58dc-b8bc-7a2ca5c1b5ee"
+PrecompileTools = "aea7be01-6a6a-4083-8856-8a6e6704d82a"
 Sockets = "6462fe0b-24de-5631-8697-dd941f90decc"
 ZeroMQ_jll = "8f1865be-045e-5c20-9c9f-bfbfb0764568"
 
 [compat]
+PrecompileTools = "1"
 ZeroMQ_jll = "4"
 julia = "1.3"
 

src/ZMQ.jl

@@ -43,4 +43,32 @@ function __init__()
     end
 end
 
+using PrecompileTools
+@compile_workload begin
+    __init__()
+    # The ZMQ scoping below isn't necessary, but it makes it easier to copy/paste
+    # the workload to test impact.
+    s=Socket(PUB)
+    ZMQ.close(s)
+
+    s1=Socket(REP)
+    s1.sndhwm = 1000
+    s1.linger = 1
+    s1.routing_id = "abcd"
+
+    s2=Socket(REQ)
+
+    ZMQ.bind(s1, "tcp://*:5555")
+    ZMQ.connect(s2, "tcp://localhost:5555")
+
+    msg = Message("test request")
+
+    ZMQ.send(s2, msg)
+    unsafe_string(ZMQ.recv(s1))
+    ZMQ.send(s1, Message("test response"))
+    unsafe_string(ZMQ.recv(s2))
+    ZMQ.close(s1)
+    ZMQ.close(s2)
+end
+
 end