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A job's processes have completed An event has been registered for the key being waited on A low memory resource condition exists
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Mutex (aka Mutant) Process Semaphore Thread Waitable Timer (Auto-Reset)
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A thread calls ReleaseMutex (once per corresponding wait call) The process has exited The semaphore count has gone above 0 The thread has terminated Timer has expired
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than these other primitives for several reasons, including the costly kernel transitions incurred for each API call made on one Because kernel objects are allocated inside kernel memory, only code running in kernel-mode can access them The alternative user-mode abstractions typically use kernel objects to implement waiting and signaling, but they are written to avoid kernel transitions wherever possible So if kernel objects are generally more expensive to use, why would you ever want to use one Aside from being the core primitives out of which everything is built and facilitating interoperability with legacy code, there are a few useful features that kernel objects provide that normally can't be accessed if you only use the user-mode synchronization mechanisms
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Kernel objects can be used for interprocess synchronization They can be named and later looked up and, hence, can be a great way to protect machine-wide shared state In the case of the CLR, they also can be used for inter-AppDomain synchronization, which other synchronization mechanisms usually don' t support This feature is a double-edged sword, however: with longer state lifetime comes great reliability responsibility, particularly in the area of recovering corrupt state after a process fails
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Kernel objects can be secured via assigning access control lists (ACLs) and by requesting certain access rights when instantiating a new or finding an existing kernel object For programs that use standard Windows security mechanisms, this can be an attractive feature, and it is typically not supported by other user-mode abstractions
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You have more control over and can perform more sophisticated waits when using kernel objects, such as waiting for all or one out of a collection of objects to become signaled This can be a very power ful capability, and there is generally no substitute on the platform that provides all of the same features Similarly, you can decide whether to issue an alertable wait (to dispatch APCs) or to pump for GUI or COM RPC messages-two features generally not supported by many other synchronization mechanisms Kernel objects can be used to interopera te between native and managed code
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Simply put, kernel objects are more powerful and comprise the base of the Windows platform's architectural support for concurrency Many situ ations call for using one directly, although there are plenty of (possibly cheaper) alternatives to consider And even in cases that do not call for their use, your API of choice will undoubtedly end up using them indirectly, whether you are required to know this or not A solid understanding of them is always useful
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Waiting in Native Code Let's now turn to the general-purpose wait APIs, starting with the native APIs After that, we'll see how waiting differs in the eLR Last, we'll look at all the specific kernel objects, what makes them unique, and how they are used
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The simplest way to wait on a kernel object in Win32 is to use one of the four standard waiting APIs mentioned earlier The first two APIs allow you to wait on a single object, while the latter two enable waiting for multiple (either any or all) to become signaled:
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DWORD WINAPI Wa i t F o r S i n g leOb j e c t ( HAN D L E h H a n d l e , DWORD dwMi l l i se c o n d s )j DWORD WINAPI Wa i t For S i ngleObj e c t E x ( HANDLE h H a n d l e , DWORD dwMi l l i secon d s , BOOl bAlertable
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