Diez B. Roggisch wrote:
Astley Le Jasper schrieb:
I have a number of threads that write to a database. I have created a
thread lock, but my question is this:
- If one thread hits a lock, do a) all the other threads stop, or b)
just the ones that come to the same lock?
Only the ones coming the the same lock.
- I presume that the answer is b. In which case do the threads stop
only if they come to the same instance of a lock. For example, you
could have a lock instance for one database and another instance for
another database (first_db_thread_lock = threading.RLock() ....
second_db_thread_lock = threading.RLock()).
There is nothing like "not an instance of a lock". So it's essentially
the same question as the first, and thus the answer is also: yes, only
for the *same* lock, which is an instance.
Diez
Note that if you're using MySQLdb, there are some restrictions on threading.
Only one thread at a time can use each connection to the database. But you
can create multiple connections to the same database at the same time from
a single program, and run them concurrently.
John Nagle
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