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Pthread Error Values

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PTHREAD_CREATE(3) NAME top pthread_create - create a new thread SYNOPSIS top #include int pthread_create(pthread_t *thread, const pthread_attr_t *attr, void *(*start_routine) (void *), void *arg); pthread_create example Compile and link with -pthread. DESCRIPTION top The pthread_create()

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function starts a new thread in the calling process. The new thread starts execution by invoking start_routine(); arg is passed pthread_create arguments as the sole argument of start_routine(). The new thread terminates in one of the following ways: * It calls pthread_exit(3), specifying an exit status value that is available to another thread in the same pthread_create arguments explanation process that calls pthread_join(3). * It returns from start_routine(). This is equivalent to calling pthread_exit(3) with the value supplied in the return statement. * It is canceled (see pthread_cancel(3)). * Any of the threads in the process calls exit(3), or the main thread performs a return from main(). This causes the termination of all threads in the process. The attr argument points to a pthread_attr_t structure whose contents

Pthread_create Linux

are used at thread creation time to determine attributes for the new thread; this structure is initialized using pthread_attr_init(3) and related functions. If attr is NULL, then the thread is created with default attributes. Before returning, a successful call to pthread_create() stores the ID of the new thread in the buffer pointed to by thread; this identifier is used to refer to the thread in subsequent calls to other pthreads functions. The new thread inherits a copy of the creating thread's signal mask (pthread_sigmask(3)). The set of pending signals for the new thread is empty (sigpending(2)). The new thread does not inherit the creating thread's alternate signal stack (sigaltstack(2)). The new thread inherits the calling thread's floating-point environment (fenv(3)). The initial value of the new thread's CPU-time clock is 0 (see pthread_getcpuclockid(3)). Linux-specific details The new thread inherits copies of the calling thread's capability sets (see capabilities(7)) and CPU affinity mask (see sched_setaffinity(2)). RETURN VALUE top On success, pthread_create() returns 0; on error, it returns an error number, and the contents of *thread are undefined. ERRORS top EAGAIN Insufficient resources to create another thread. EAGAIN A system-imposed limit on the number of threa

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Pthread_join

Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Return Value of a pthread_create up vote 2 down vote favorite http://man7.org/linux/man-pages/man3/pthread_create.3.html 1 I am attempting to make the following call, PID = pthread_create(&t, NULL, schedule_sync(sch,t1), NULL); schedule_sync returns a value, I would like to be able to grab that value, but from what Ive read about pthread_create, you should pass a "void" function. Is it possible to get the return value of schedule_sync, or am I going to have to modify some kind of parameter passed in? Thanks for the http://stackoverflow.com/questions/3580995/return-value-of-a-pthread-create help! c pthreads share|improve this question asked Aug 27 '10 at 2:44 onaclov2000 1,60232646 1 Also you should pass one argument for start routine (schedule_sync in your case). see this example amparo.net/ce155/thread-ex.html . You can create a struct with those two arguments sch and t1 –Kamal Aug 27 '10 at 3:02 add a comment| 3 Answers 3 active oldest votes up vote 3 down vote accepted pthread_create returns an code. It doesn't create a new process so there's no new PID. To pass a pointer to your function, take its address with &. pthread_create takes a function of form void *func( void * ). So assuming schedule_sync is the thread function, struct schedule_sync_params { foo sch; bar t1; int result; pthread_t thread; } args = { sch, t1 }; int err = pthread_create( &args.thread, NULL, &schedule_sync, &args ); ..... schedule_sync_params *params_ptr; // not necessary if you still have the struct err = pthread_join( args.thread, ¶ms_ptr ); // just pass NULL instead ..... void *schedule_sync( void *args_v ) { shedule_sync_params *args = args_v; .... args->result = return_value; return args; } share|improve this answer edited Aug 27 '10 at 3:12 answered Aug 27 '10 at 2:51 Potatoswatter 92.6k9153301 Sorry, schedule_sync is p

-pthread. Description The pthread_create() function starts a new thread in the calling process. The new thread starts execution by invoking start_routine(); arg is passed as the https://linux.die.net/man/3/pthread_create sole argument of start_routine(). The new thread terminates in one of http://docs.oracle.com/cd/E19253-01/816-5137/tlib-24/index.html the following ways: * It calls pthread_exit(3), specifying an exit status value that is available to another thread in the same process that calls pthread_join(3). * It returns from start_routine(). This is equivalent to calling pthread_exit(3) with the value supplied in the return statement. * pthread_create arguments It is canceled (see pthread_cancel(3)). * Any of the threads in the process calls exit(3), or the main thread performs a return from main(). This causes the termination of all threads in the process. The attr argument points to a pthread_attr_t structure whose contents are used at thread creation time to determine attributes for the new pthread error values thread; this structure is initialized using pthread_attr_init(3) and related functions. If attr is NULL, then the thread is created with default attributes. Before returning, a successful call to pthread_create() stores the ID of the new thread in the buffer pointed to by thread; this identifier is used to refer to the thread in subsequent calls to other pthreads functions. The new thread inherits a copy of the creating thread's signal mask (pthread_sigmask(3)). The set of pending signals for the new thread is empty (sigpending(2)). The new thread does not inherit the creating thread's alternate signal stack (sigaltstack(2)). The new thread inherits the calling thread's floating-point environment (fenv(3)). The initial value of the new thread's CPU-time clock is 0 (see pthread_getcpuclockid(3)). Linux-specific details The new thread inherits copies of the calling thread's capability sets (see capabilities(7)) and CPU affinity mask (see sched_setaffinity(2)). Return Value On success, pthread_create() returns 0; on error, it returns an error number, and the contents of *thread are undefined. Errors EAGAIN Insufficient resource

Waiting for Thread Termination pthread_create Return Values pthread_create() returns zero when the call completes successfully. Any other return value indicates that an error occurred. When any of the following conditions are detected, pthread_create() fails and returns the corresponding value. EAGAIN Description: A system limit is exceeded, such as when too many threads have been created. EINVAL Description: The value of tattr is invalid. EPERM Description: The caller does not have appropriate permission to set the required scheduling parameters or scheduling policy. Previous: pthread_create SyntaxNext: Waiting for Thread Termination © 2010, Oracle Corporation and/or its affiliates

 

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