In this blog post, we will learn about some of the possible causes that can cause errors when checking the ipm_subtree folder in memory, and then point out some ways to work around this issue.
PTHREAD_CLEANUP_PUSH (3) NAME of Linux Programmer’s Manual pthread_cleanup_push (3)
Higher
pthread_cleanup_push, pthread_cleanup_pop 2. Push the thread and pop it Cancellation cleaning manager
SUMMARY Above
#include Space pthread_cleanup_push (void (* routine) (void *), void * arg); Break pthread_cleanup_pop (int run); Compile and compile with -pthread.
DESCRIPTION Above
These functions modify the calling thread’s thread stack. Manage undo correction. Cleaning manager is a real feature many others start automatically when a message is canceled (or various other circumstances listed below); he could because For example, unlock a mutex so that it can be accessed by others. Contribution to the process. The pthread_cleanup_push () function pushes the strategy up stack of cleaners. When the routine is later is called, this task is incorrectly given as a special argument. The pthread_cleanup_pop () function removes a subroutine from each of our vertices. creates a cleanup manager from the stack and optionally startskills him if Execute a non-zero value. The rollback cleanup handler is removed from the collection and Carried out under the following circumstances: 1. When the corresponding thread is terminated, any hosted cleanup will be performed. Handlers are displayed but executed in reverse order in which they were pushed onto the stack. 2. When the thread terminates as a result of calling pthread_exit (3), all Cleaning managers operate as described in this particular previous section. Period. (Cleanup handlers are usually not called when a stream ends up going backwards Thread function. ) 3. When a thread calls a nonzero value of pthread_cleanup_pop () The highest cleanup handler is displayed for each Execute argument and completed. POSIX.1 allows pthread_cleanup_push () and pthread_cleanup_pop () also for implementing macros that expand to text filled with ” connected to ” or for this reason the caller must make sure that that the calls for these actions are duplicated in one The functionality is close to the same the level of lexical nesting. (In others In other words, it becomes easy with the cleaning manager during Runs a specific section of all code.) Calling longjmp (3) (siglongjmp (3)) results in undefined ends if all calls were made to pthread_cleanup_push (), or pthread_cleanup_pop () does not have a corresponding Combine call since the specific jump buffer was full just like setjmp (3) (sigsetjmp (3)). Similarly, call longjmp (3) (siglongjmp (3)) from a stunning clean An absence handler gives undefined results if its jump buffer was not present This manager’s report is also populated with setjmp (3) (sigsetjmp (3)).
RETURN COST Is Higher
These functions do not follow and do not return a value.
ERROR Above
No errors occurred.
ATTRIBUTES Above
For a better explanation of the terms used in Section Type, see Section Type. Attributes (7). â – – – – – – – … â “‚ Interface â “‚ Attribute â “‚ Meaning â “‚ • • • • • • • • •… – ––––––––––––––––––––––––––––––––––––––– ––––––––––––– –––––––––––––––––– ––––––––––––––– – pthread_cleanup_push (), – Thread Safety – MT-Safe – â ”‚ pthread_cleanup_pop () ⠔┠⠔ • • • • • • • • …
FIT Height
POSIX.1-2001, POSIX.1-2008.
NOTES Above
On Linux, pthread_cleanup_push () and pthread_cleanup_pop () Functions are implemented by macros that expand into text “above” “is on. This means that the variables declared for related calls when you want to use these functions to be visible only to what extent. POSIX.1 says that the effect is Return, Break, Continue, or go too early to parenthesize the notebook again pthread_cleanup_push () and pthread_cleanup_pop () are probably undefined. This should be avoided in portable applications.
EXAMPLES Above
The program it contains is a simple example of how to use functions described on this page. The program creates a stream which executes a specific loop surrounded by pthread_cleanup_push () and pthread_cleanup_pop (). This loop increments the global variable, cnt, about once a second. According to command line arguments often includingare, the main wire sends to the additional wire Cancellation request or sets the variable Everyone as another thread exited to take over its loop and exit normally (exiting To restore). In the next shell session, thread number one sends Cancellation request for another main wire: $ ./a.out A new conversation has begun cnt = 0 cnt = 1 Drop the thread Cleaning managers called The topic is closed; cnt means 0 Above we can see which thread was canceled, and The cleaning manager is called to terminate the contract and adjusts the cost. global variable cnt as path to 0. During the next execution, the master defines a global variable, causes the normal termination of other obligations: rrr ./a.out x A new cautious branch has begun cnt means 0 cnt = 1 Refuel normally; cnt done means 2 From the above, we can see that none of our cleanup managers started. (because cleanup_pop_arg might be 0) and therefore the value withcnt does not require reset. On the next iteration, the main program defines a global variable, forces the other thread to exit normally and gives you Nonzero value for cleanup_pop_arg: RR ./a.out x 1 A new conversation has begun cnt matches 0 cnt matches 1 Cleaning managers called The stream ended normally; cnt is 0 Above we see who, although no one canceled the thread, the cleanup manager was executed because the argument was safe pthread_cleanup_pop () is nonzero. Source of the program #include
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#include #include #include #include #define handle_error_en (en, msg) n do errno matches en; Error message); Exit (EXIT_FAILURE); during (0) static interval ended = 0; static int cleanup_pop_arg = 0; Noise int cnt = 0; Static vacuum cleanup_handler (empty * argument) printf (“Cleanup manager called n”); cnt = 0; Static vacuum * thread_start (invalid * argument) time_t start, act; printf (“A new thread has started n”); pthread_cleanup_push (cleanup_handler, NULL); curr matches start = time (NULL); while you (! finished) pthread_testcancel (); / * One undo point * / if (curr
