Bagaimana untuk mengagihkan kerja kepada satu set benang pekerja dalam Python?

Untuk mengedarkan kerja antara sekumpulan benang pekerja, gunakan modul .futures serentak, khususnya Kelas ThreadPoolExecutor.

Dengan alternatif ini, anda boleh mengodkan logik anda sendiri secara manual jika anda mahukan kawalan yang baik ke atas algoritma penjadualan. Gunakan modul baris gilir untuk membuat baris gilir yang mengandungi senarai kerja. Kelas Queue mengekalkan senarai objek dan mempunyai kaedah .put(obj) yang menambah item pada baris gilir dan kaedah .get() yang mengembalikan item. Kelas ini akan menjaga penguncian yang diperlukan untuk memastikan setiap kerja hanya diedarkan sekali.

Contoh

Berikut adalah contoh -

import threading, queue, time

# The worker thread gets jobs off the queue. When the queue is empty, it
# assumes there will be no more work and exits.
def worker():
   print('Running worker')
   time.sleep(0.1)
   while True:
      try:
         arg = q.get(block=False)
      except queue.Empty:
         print('Worker', threading.current_thread(), end=' ')
         print('queue empty')
         break
      else:
         print('Worker', threading.current_thread(), end=' ')
         print('running with argument', arg)
         time.sleep(0.5)

# Create a queue
q = queue.Queue()

# Start a pool of 5 workers
for i in range(5):
   t = threading.Thread(target=worker, name='worker %i' % (i+1))
   t.start()

# Begin adding work to the queue
for i in range(50):
   q.put(i)

# Give threads time to run
print('Main thread sleeping')
time.sleep(5)

Output

Running worker
Running worker
Running worker
Running worker
Running worker
Main thread sleeping
Worker  running with argument 0
Worker  running with argument 1
Worker  running with argument 2
Worker  running with argument 3
Worker  running with argument 4
Worker  running with argument 5
Worker  running with argument 6
Worker  running with argument 7
Worker  running with argument 8
Worker  running with argument 9
Worker  running with argument 10
Worker  running with argument 11
Worker  running with argument 12
Worker  running with argument 13
Worker  running with argument 14
Worker  running with argument 15
Worker  running with argument 16
Worker  running with argument 17
Worker  running with argument 18
Worker  running with argument 19
Worker  running with argument 20
Worker  running with argument 21
Worker  running with argument 22
Worker  running with argument 23
Worker  running with argument 24
Worker  running with argument 25
Worker  running with argument 26
Worker  running with argument 28
Worker  running with argument 29
Worker  running with argument 27
Worker  running with argument 30
Worker  running with argument 31
Worker  running with argument 32
Worker  running with argument 33
Worker  running with argument 34
Worker  running with argument 35
Worker  running with argument 36
Worker  running with argument 37
Worker  running with argument 38
Worker  running with argument 39
Worker  running with argument 40
Worker  running with argument 41
Worker  running with argument 42
Worker  running with argument 43
Worker  running with argument 44
Worker  running with argument 45
Worker  running with argument 46
Worker  running with argument 47
Worker  running with argument 48
Worker  running with argument 49
Worker  queue empty
Worker  queue empty
Worker  queue empty
Worker  queue empty
Worker  queue empty

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