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Diffstat (limited to 'ports_smp/linux/gnu/readme_threadx.txt')
| -rw-r--r-- | ports_smp/linux/gnu/readme_threadx.txt | 58 |
1 files changed, 29 insertions, 29 deletions
diff --git a/ports_smp/linux/gnu/readme_threadx.txt b/ports_smp/linux/gnu/readme_threadx.txt index 19d7c5b6..63cc3f34 100644 --- a/ports_smp/linux/gnu/readme_threadx.txt +++ b/ports_smp/linux/gnu/readme_threadx.txt @@ -1,4 +1,4 @@ - Microsoft's Azure RTOS ThreadX SMP for Linux + Microsoft's Azure RTOS ThreadX SMP for Linux Using the GNU GCC Tools @@ -8,29 +8,29 @@ First make sure you are in the "example_build" directory. Also, make sure that you have setup your path and other environment variables necessary for the GNU development environment. The following command retrieves and installs GCC multilib on a Ubuntu system: - + sudo apt-get install gcc-multilib -At this point you may run the GNU make command to build the ThreadX SMP core -library. This will build the ThreadX SMP run-time environment in the -"example_build" directory. +At this point you may run the GNU make command to build the ThreadX SMP core +library. This will build the ThreadX SMP run-time environment in the +"example_build" directory. make tx.a -you should now observe the compilation of the ThreadX SMP library source. At the +you should now observe the compilation of the ThreadX SMP library source. At the end of the make, they are all combined into the run-time library file: tx.a. This file must be linked with your application in order to use ThreadX. - + 2. Demonstration System -Building the demonstration is easy; simply execute the GNU make command while -inside the "example_build" directory. +Building the demonstration is easy; simply execute the GNU make command while +inside the "example_build" directory. make sample_threadx -You should observe the compilation of sample_threadx.c (which is the demonstration -application) and linking with tx.a. The resulting file DEMO is a binary file +You should observe the compilation of sample_threadx.c (which is the demonstration +application) and linking with tx.a. The resulting file DEMO is a binary file that can be executed. 2.1 Includes @@ -56,15 +56,15 @@ the tx_port.h header to include tx_user.h. 3. System Initialization -The system entry point is at main(), which is defined in the application. -Once the application calls tx_kernel_enter, ThreadX SMP starts running and -performs various initialization duties prior to starting the scheduler. The +The system entry point is at main(), which is defined in the application. +Once the application calls tx_kernel_enter, ThreadX SMP starts running and +performs various initialization duties prior to starting the scheduler. The Linux-specific initialization is done in the function _tx_initialize_low_level, -which is located in the file tx_initialize_low_level.c. This function is -responsible for setting up various system data structures and simulated +which is located in the file tx_initialize_low_level.c. This function is +responsible for setting up various system data structures and simulated interrupts - including the periodic timer interrupt source for ThreadX. -In addition, _tx_initialize_low_level determines the first available +In addition, _tx_initialize_low_level determines the first available address for use by the application. In Linux, this is basically done by using malloc to get a big block of memory from Linux. @@ -73,12 +73,12 @@ by using malloc to get a big block of memory from Linux. ThreadX SMP for Linux is implemented using POSIX pthreads. Each application thread in ThreadX SMP actually runs as a Linux pthread. The determination of -which application thread to run is made by the ThreadX SMP scheduler, which -itself is a Linux pthread. The ThreadX SMP scheduler is the highest priority +which application thread to run is made by the ThreadX SMP scheduler, which +itself is a Linux pthread. The ThreadX SMP scheduler is the highest priority thread in the system. Interrupts in ThreadX_SMP Linux are also simulated by pthreads. A good example -is the ThreadX SMP system timer interrupt, which can be found in +is the ThreadX SMP system timer interrupt, which can be found in tx_initialize_low_level.c. ThreadX SMP for linux utilizes the API pthread_setschedparam() which requires @@ -89,12 +89,12 @@ to run a ThreadX SMP application: 5. Improving Performance -The distribution version of ThreadX SMP is built without any compiler -optimizations. This makes it easy to debug because you can trace or set -breakpoints inside of ThreadX SMP itself. Of course, this costs some -performance. To make it run faster, you can change the makefile to -enable all compiler optimizations. In addition, you can eliminate the -ThreadX SMP basic API error checking by compiling your application code with the +The distribution version of ThreadX SMP is built without any compiler +optimizations. This makes it easy to debug because you can trace or set +breakpoints inside of ThreadX SMP itself. Of course, this costs some +performance. To make it run faster, you can change the makefile to +enable all compiler optimizations. In addition, you can eliminate the +ThreadX SMP basic API error checking by compiling your application code with the symbol TX_DISABLE_ERROR_CHECKING defined. @@ -102,7 +102,7 @@ symbol TX_DISABLE_ERROR_CHECKING defined. ThreadX SMP provides simulated interrupt handling with Linux pthreads. Simulated interrupt threads may be created by the application or may be added to the -simulated timer interrupt defined in tx_initialize_low_level.c. The following +simulated timer interrupt defined in tx_initialize_low_level.c. The following format for creating simulated interrupts should be used: 6.1 Data structures @@ -133,7 +133,7 @@ struct sched_param sp; 6.3 Simulated Interrupt Thread Template The following is a template for the simulated interrupt thread. This interrupt will occur on -a periodic basis. +a periodic basis. void *_sample_linux_interrupt_entry(void *p) { @@ -154,7 +154,7 @@ struct timespec ts; /* Call ThreadX SMP context restore for interrupt completion. */ _tx_thread_context_restore(); - } + } } |