Question about synchronizing two methods...
i have 2 methods:
writeData() //method 1
createNewDataFile() //method 2
the main thread will be using method 1 quite frequently. In method 2, a separate thread will be waking up every 10 minutes or so and doing some maintenance on the file written to in method 1. So, when the thread is in method 2 i need method 1 to standby and wait. I also want the opposite, that when the main thread is in method 2 method 1 will stand by.
Any help is appreciated!
799454 wrote:
So wait,
i thought synchronized only worked on the actual methods where it is declared:Using the synchronized keyword obtains a lock. Each object has exactly one lock associated with it. Once a thread has obtained an object's lock, no other thread can obtain that lock (and hence cannot enter a sync block on that lock) until the first thread releases it by leaving its sync block or calling wait().
so, you're saying that if i declare:
synchronized method 1
synchronized method 2
then i have a single object with 2 synchronized methods, so if thread A is in EITHER of those methods, the other method will be locked as well?The method isn't "locked" per se, but yes, 1 object, 2 synced methods, if T1 is in either method, then T2 cannot enter either method.
I strongly urge you to go through that tutorial and/or a book on Java concurrency, thoroughly.
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Manager finished with warehouse...The code in "bold" (with the tokens) isn't supposed to happen concurrently as I understand it since the "warehouse after waiting" statement it's in the synchronized block with a lock on the items list and the "manager adding to items" statement is adding an item to that list through a direct reference to that list...When the manager thread notifies the items (warehouse thread), the warehouse thread does not have to wake up automatically, it has to compete for the items lock then wait for its Thread context to execute. Which means that the manage is able to continue to execute - adding to items manually, and eventually sleep()ing. When the manager thread sleeps that is a good place for a Thread context switch, and if the JVM takes that opportunity to do so, then the warehouse thread regains the lock and would prevent further access to items. But at some point the Thread context will switch again (probably when warehouse thread goes to sleep). Now the manager thread can wake up, print that it is working because that code is not protected by any synchronized lock. Then when it attempts to add to items again it blocks. Another thread context switch allows the warehouse to complete its work, finish up, and release the items lock. Manager can then get the lock on items and finish its work. The results would be exactly as you display them. Here is a possible walk-through of the threading paths taken:
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sleeping 500
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adding to itemes
unlock items
sleeping 500
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