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DL6ER
56 lines
1.8 KiB
C
56 lines
1.8 KiB
C
/* Pi-hole: A black hole for Internet advertisements
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* (c) 2017 Pi-hole, LLC (https://pi-hole.net)
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* Network-wide ad blocking via your own hardware.
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*
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* FTL Engine
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* Thread routines
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*
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* This file is copyright under the latest version of the EUPL.
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* Please see LICENSE file for your rights under this license. */
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#include "FTL.h"
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// Logic of the locks:
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// Any of the various threads (logparser, GC, client threads) is accessing FTL's data structure. Hence, they should
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// never run at the same time since the data can change half-way through, leading to unspecified behavior.
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// threadwritelock: The threadwritelock ensures that only one thread with write-access to FTL's data structure can
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// be active at any given time
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// threadreadlock: An expection to the rule of non-concurrency are the client threads, as they do need read-access
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// Therefore, it is no problem to have several of them running concurrently. Accordingly, client
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// threads do *not* have to wait at the lock if threadreadlocks is true (i.e. a client listener
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// thread has activated this thread lock earlier)
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bool threadwritelock = false;
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bool threadreadlock = false;
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void enable_read_lock(const char *message)
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{
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while(threadwritelock) sleepms(5);
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if(debugthreads)
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logg("Thread lock enabled (R ): %s", message);
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// Set threadwritelock
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threadwritelock = false;
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// Set threadreadlock (see above)
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threadreadlock = true;
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}
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void enable_read_write_lock(const char *message)
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{
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while(threadwritelock || threadreadlock) sleepms(5);
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if(debugthreads)
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logg("Thread lock enabled (RW): %s", message);
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// Set threadwritelock
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threadwritelock = true;
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}
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void disable_thread_locks(const char *message)
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{
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threadwritelock = false;
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threadreadlock = false;
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if(debugthreads)
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logg("Thread lock disabled: %s", message);
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}
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