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→Freeze Points
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== Freeze Points == | == Freeze Points == | ||
Nuwa make wrappers for all functions being freeze points. All these wrappers are in BionicGlue.cpp. We use --wrap arguments to make GNU LD redirect all function calls of freeze points to respective wrappers. In most time, these wrapper will call respective back functions. For example, the wrapper of pthread_mutex_lock() will call pthread_mutex_lock() to do the task. These wrappers will be blocked on a lock, sThreadFreezeLock, once Nuwa process run into a stable state. We say Nuwa process is frozen if all threads are blocked at these wrappers. | Nuwa make wrappers for all functions being freeze points. All these wrappers are in BionicGlue.cpp. We use --wrap arguments to make GNU LD redirect all function calls of freeze points to respective wrappers. In most time, these wrapper will call respective back functions. For example, the wrapper of pthread_mutex_lock() will call pthread_mutex_lock() to do the task. These wrappers will be blocked on a lock, sThreadFreezeLock, for freezing the calling thread once Nuwa process run into a stable state. We say Nuwa process is frozen if all threads are blocked at these wrappers. | ||
== Threads == | == Threads == | ||