Is synchronization really needed in multithreading in python?
I am a little bit confused with why synchronization is needed in multithreading in python. Given the Global internal lock, there can only be one thread accessing the python object at a time right? so why do we still need synchronization library such as queue.Queue?
python multithreading synchronization
asked Nov 13 '18 at 21:09
Kaiyue WangKaiyue Wang
628
add a comment |
I am a little bit confused with why synchronization is needed in multithreading in python. Given the Global internal lock, there can only be one thread accessing the python object at a time right? so why do we still need synchronization library such as queue.Queue?
python multithreading synchronization
asked Nov 13 '18 at 21:09
Kaiyue WangKaiyue Wang
628
add a comment |
I am a little bit confused with why synchronization is needed in multithreading in python. Given the Global internal lock, there can only be one thread accessing the python object at a time right? so why do we still need synchronization library such as queue.Queue?
python multithreading synchronization
asked Nov 13 '18 at 21:09
Kaiyue WangKaiyue Wang
628
I am a little bit confused with why synchronization is needed in multithreading in python. Given the Global internal lock, there can only be one thread accessing the python object at a time right? so why do we still need synchronization library such as queue.Queue?
python multithreading synchronization
python multithreading synchronization
asked Nov 13 '18 at 21:09
Kaiyue WangKaiyue Wang
628
asked Nov 13 '18 at 21:09
Kaiyue WangKaiyue Wang
628
asked Nov 13 '18 at 21:09
Kaiyue WangKaiyue Wang
628
asked Nov 13 '18 at 21:09
Kaiyue WangKaiyue Wang
628
asked Nov 13 '18 at 21:09
Kaiyue WangKaiyue Wang
628
628
add a comment |
add a comment |
1 Answer
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This is because pulling an item from a list and marking it as pulled, processing it and marking it as done are no atomic operation.
answered Nov 13 '18 at 21:24
jhinghausjhinghaus
261517
1
More generally, to lock a data structure during multiple operations. The interpreter may even switch threads in the middle of a line of code, if that line consists of multiple operations.
– soundstripe
Nov 13 '18 at 21:31
add a comment |
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1 Answer
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1 Answer
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This is because pulling an item from a list and marking it as pulled, processing it and marking it as done are no atomic operation.
answered Nov 13 '18 at 21:24
jhinghausjhinghaus
261517
1
More generally, to lock a data structure during multiple operations. The interpreter may even switch threads in the middle of a line of code, if that line consists of multiple operations.
– soundstripe
Nov 13 '18 at 21:31
add a comment |
This is because pulling an item from a list and marking it as pulled, processing it and marking it as done are no atomic operation.
answered Nov 13 '18 at 21:24
jhinghausjhinghaus
261517
1
More generally, to lock a data structure during multiple operations. The interpreter may even switch threads in the middle of a line of code, if that line consists of multiple operations.
– soundstripe
Nov 13 '18 at 21:31
add a comment |
This is because pulling an item from a list and marking it as pulled, processing it and marking it as done are no atomic operation.
answered Nov 13 '18 at 21:24
jhinghausjhinghaus
261517
This is because pulling an item from a list and marking it as pulled, processing it and marking it as done are no atomic operation.
answered Nov 13 '18 at 21:24
jhinghausjhinghaus
261517
edited Nov 13 '18 at 21:47
answered Nov 13 '18 at 21:24
jhinghausjhinghaus
261517
answered Nov 13 '18 at 21:24
jhinghausjhinghaus
261517
answered Nov 13 '18 at 21:24
jhinghausjhinghaus
261517
261517
1
More generally, to lock a data structure during multiple operations. The interpreter may even switch threads in the middle of a line of code, if that line consists of multiple operations.
– soundstripe
Nov 13 '18 at 21:31
add a comment |
1
More generally, to lock a data structure during multiple operations. The interpreter may even switch threads in the middle of a line of code, if that line consists of multiple operations.
– soundstripe
Nov 13 '18 at 21:31
1
1
More generally, to lock a data structure during multiple operations. The interpreter may even switch threads in the middle of a line of code, if that line consists of multiple operations.
– soundstripe
Nov 13 '18 at 21:31
More generally, to lock a data structure during multiple operations. The interpreter may even switch threads in the middle of a line of code, if that line consists of multiple operations.
– soundstripe
Nov 13 '18 at 21:31
add a comment |
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