C_python_ipc
Author: Kiyoon Kim (https://kiyoon.kim)
Message Queue based Interprocess Communication (IPC) between Python and C. There are sender and receiver code for each language.
The senders will send:
- string
- two doubles
- one array (or numpy)
- one double and one array (or numpy)
And the receivers receive the byte formatted data and unpack.
Dependencies
- Python >= 3.6
- sysv_ipc (python package) - Only supports Unix (Linux and MacOS), not Windows.
- numpy (python package)
For Python 2 support, see the older version: v0.1
Usage
Build C programs
make
Run receiver. For example, C receiver:
./receiver
In a different terminal, execute sender. For example, Python sender with String, double (float64), numpy formats.
./sender.py
Watch what happens on the receiver!
Example output
sender.py
$ python3 sender.py
string sent: sample string
two doubles sent: 1234.56789, 9876.12345
numpy array sent: [[ 0 1 2 3 4 5 6 7]
[ 8 9 10 11 12 13 14 15]]
one double and numpy array sent: 1234.56789, [[0 1 2 3]
[4 5 6 7]]
string sent: sample string
two doubles sent: 1234.56789, 9876.12345
numpy array sent: [[ 0 1 2 3 4 5 6 7]
[ 8 9 10 11 12 13 14 15]]
one double and numpy array sent: 1234.56789, [[0 1 2 3]
[4 5 6 7]]
receiver (C)
$ ./receiver
*** New message received ***
Raw data: 73 61 6D 70 6C 65 20 73 74 72 69 6E 67 00 00 00
Interpreted as string: sample string
*** New message received ***
Raw data: E7 C6 F4 84 45 4A 93 40 58 A8 35 CD 0F 4A C3 40
Interpreted as two doubles: 1234.567890, 9876.123450
*** New message received ***
Raw data: 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
Interpreted as array: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
*** New message received ***
Raw data: E7 C6 F4 84 45 4A 93 40 00 01 02 03 04 05 06 07
Interpreted as one double and array: 1234.567890, 0 1 2 3 4 5 6 7
*** New message received ***
Raw data: 73 61 6D 70 6C 65 20 73 74 72 69 6E 67 00 00 00
Interpreted as string: sample string
*** New message received ***
Raw data: E7 C6 F4 84 45 4A 93 40 58 A8 35 CD 0F 4A C3 40
Interpreted as two doubles: 1234.567890, 9876.123450
*** New message received ***
Raw data: 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
Interpreted as array: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
*** New message received ***
Raw data: E7 C6 F4 84 45 4A 93 40 00 01 02 03 04 05 06 07
Interpreted as one double and array: 1234.567890, 0 1 2 3 4 5 6 7
References
http://weifan-tmm.blogspot.kr/2015/09/invoke-floating-point-logic-set-option_4.html
http://forum.falinux.com/zbxe/index.php?document_srl=420147&mid=C_LIB