task switching

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Read-Only Author srilatha ayyannagari Posted 10-May-2003 13:03 GMT Toolset None	task switching srilatha ayyannagari Hi, Does os_send_token() cause task switching?If so, my code given below is not working properly,task_1 is running continuously, and task_2 is never getting executed. Please clarify my doubt. void setup_serial_io (void) { SCON = 0x50; /* SCON: mode 1, 8-bit UART, enable rcvr */ TMOD |= 0x20; /* TMOD: timer 1, mode 2, 8-bit reload */ TH1 = 0xF0; /* TH1: reload value */ TR1 = 1; /* TR1: timer 1 run */ TI = 1; /* TI: set TI to send first char of UART */ } void task_1 (void) _task_ TASK1 _priority_ 0 { while (1) { // Delay for 200 ticks os_wait (K_MBX + SEM_PRINTF, 255, 0); // Wait for printf printf ("Task # %d\n", (int) os_running_task_id ()); os_send_token (SEM_PRINTF); // Done with printf } } void task_2 (void) _task_ TASK2 _priority_ 0 { while (1) { os_wait (K_MBX + SEM_PRINTF, 255, 0); // Wait for printf printf ("Task # %d\n", (int) os_running_task_id ()); os_send_token (SEM_PRINTF); // Done with printf } } regards, srilatha.
Read-Only Author Jon Ward Posted 10-May-2003 16:59 GMT Toolset None	RE: task switching Jon Ward I don't believe it does. Take another look at the example in http://www.keil.com/support/docs/690.htm. There is a short delay before checking for the semaphore. I seem to recal that this was used in the example to allow other tasks to run. Jon
Read-Only Author srilatha ayyannagari Posted 29-May-2003 11:35 GMT Toolset None	RE: task switching srilatha ayyannagari Thanx for your reply Jon.Is is correct that, to switch from one task to another a short delay must be there? or is there any other way? regards, srilatha
Read-Only Author Jon Ward Posted 29-May-2003 18:07 GMT Toolset None	RE: task switching Jon Ward Yep - That's correct. Jon

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