Revision 0:f8e6d9529dbd, committed 2020-07-26

Comitter:

radhey04ec

Date:

Sun Jul 26 13:15:49 2020 +0000

Child:

1:4f150e2895bf

Commit message:

MUTEX_TIME BASED LOCK SYSTEM

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/.gitignore	Sun Jul 26 13:15:49 2020 +0000
@@ -0,0 +1,4 @@
+.build
+.mbed
+projectfiles
+*.py*

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/CONTRIBUTING.md	Sun Jul 26 13:15:49 2020 +0000
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+# Contributing to Mbed OS
+
+Mbed OS is an open-source, device software platform for the Internet of Things. Contributions are an important part of the platform, and our goal is to make it as simple as possible to become a contributor.
+
+To encourage productive collaboration, as well as robust, consistent and maintainable code, we have a set of guidelines for [contributing to Mbed OS](https://os.mbed.com/docs/mbed-os/latest/contributing/index.html).

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/README.md	Sun Jul 26 13:15:49 2020 +0000
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+![](./resources/official_armmbed_example_badge.png)
+# Blinky Mbed OS example
+
+The example project is part of the [Arm Mbed OS Official Examples](https://os.mbed.com/code/) and is the [getting started example for Mbed OS](https://os.mbed.com/docs/mbed-os/v5.14/quick-start/index.html). It contains an application that repeatedly blinks an LED on supported [Mbed boards](https://os.mbed.com/platforms/).
+
+You can build the project with all supported [Mbed OS build tools](https://os.mbed.com/docs/mbed-os/latest/tools/index.html). However, this example project specifically refers to the command-line interface tool [Arm Mbed CLI](https://github.com/ARMmbed/mbed-cli#installing-mbed-cli).
+(Note: To see a rendered example you can import into the Arm Online Compiler, please see our [import quick start](https://os.mbed.com/docs/mbed-os/latest/quick-start/online-with-the-online-compiler.html#importing-the-code).)
+
+1. [Install Mbed CLI](https://os.mbed.com/docs/mbed-os/latest/quick-start/offline-with-mbed-cli.html).
+
+1. Clone this repository on your system, and change the current directory to where the project was cloned:
+
+    ```bash
+    $ git clone git@github.com:armmbed/mbed-os-example-blinky && cd mbed-os-example-blinky
+    ```
+
+    Alternatively, you can download the example project with Arm Mbed CLI using the `import` subcommand:
+
+    ```bash
+    $ mbed import mbed-os-example-blinky && cd mbed-os-example-blinky
+    ```
+
+
+## Application functionality
+
+The `main()` function is the single thread in the application. It toggles the state of a digital output connected to an LED on the board.
+
+## Building and running
+
+1. Connect a USB cable between the USB port on the board and the host computer.
+2. <a name="build_cmd"></a> Run the following command to build the example project and program the microcontroller flash memory:
+    ```bash
+    $ mbed compile -m <TARGET> -t <TOOLCHAIN> --flash
+    ```
+The binary is located at `./BUILD/<TARGET>/<TOOLCHAIN>/mbed-os-example-blinky.bin`.
+
+Alternatively, you can manually copy the binary to the board, which you mount on the host computer over USB.
+
+Depending on the target, you can build the example project with the `GCC_ARM`, `ARM` or `IAR` toolchain. After installing Arm Mbed CLI, run the command below to determine which toolchain supports your target:
+
+```bash
+$ mbed compile -S
+```
+
+## Expected output
+The LED on your target turns on and off every 500 milliseconds.
+
+
+## Troubleshooting
+If you have problems, you can review the [documentation](https://os.mbed.com/docs/latest/tutorials/debugging.html) for suggestions on what could be wrong and how to fix it.
+
+## Related Links
+
+* [Mbed OS Stats API](https://os.mbed.com/docs/latest/apis/mbed-statistics.html).
+* [Mbed OS Configuration](https://os.mbed.com/docs/latest/reference/configuration.html).
+* [Mbed OS Serial Communication](https://os.mbed.com/docs/latest/tutorials/serial-communication.html).
+* [Mbed OS bare metal](https://os.mbed.com/docs/mbed-os/latest/reference/mbed-os-bare-metal.html).
+* [Mbed boards](https://os.mbed.com/platforms/).
+
+### License and contributions
+
+The software is provided under Apache-2.0 license. Contributions to this project are accepted under the same license. Please see contributing.md for more info.
+
+This project contains code from other projects. The original license text is included in those source files. They must comply with our license guide.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun Jul 26 13:15:49 2020 +0000
@@ -0,0 +1,60 @@
+// MUTEX : PART 2  -MUTEX TIME BASED LOCKING
+
+/*As we know MUTEX have ownership in locking mechanism. Thread which locked code using mutex flag then only same thread can unblock it
+If you have not enough knowledge regarding RTOS then it leads some dangerous situation like priority inversion and Deadlock
+
+Time based unlocking help us to avoid DEADLOCK.
+Here mutex automatically unlock  the block after ending time period
+
+Program created by : Jaydeep shah -radhey04ec@gmail.com
+Date :  26 July 2020
+*/
+
+
+/* Function use
+bool trylock_for(Kernel::Clock::duration_u32 rel_time);
+Tries to lock the mutex. If it succeeds within the specified time frame (interval) the mutex is locked and stays locked until unlocked by calling the unlock function.
+
+bool trylock_until(Kernel::Clock::time_point abs_time); 
+Tries to lock the mutex. If it succeeds before the given time point is reached it locks the mutex and the mutex stays locked until unlocked by calling the unlock function.
+
+*/
+
+#include "mbed.h"
+
+Mutex Lock;
+Thread T1,T2;
+bool V;
+void common_block(const char* name, int state)
+{
+    printf("\n Thread arrive %s %d \n", name, state);
+    if (Lock.trylock_for(50)) { // try to lock the mutex: timeout = 100 ms
+        printf("\n Inside  %s state %d \n", name, state);
+        ThisThread::sleep_for(6000);               //some how process stuck in wait state
+        printf("\n outside %s state %d \n", name, state);
+        Lock.unlock(); // unlock
+    }
+    else
+    {
+        
+        printf("\n %s thread fail to lock state %d",name,state);
+    }
+}
+void fun(void const *arg)
+{
+    while(true)
+    {
+        common_block((const char *)arg,0);  //PASS STATE 0
+        wait(2);
+        common_block((const char *)arg,1);// PASS STATE 1
+        wait(2);
+    }
+}
+
+int main()
+{
+ T1.start(callback(fun,(void *)"T1"));
+ T2.start(callback(fun,(void *)"T2"));
+ fun((void *)"main");
+}   
+    

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os.lib	Sun Jul 26 13:15:49 2020 +0000
@@ -0,0 +1,1 @@
+https://github.com/ARMmbed/mbed-os/#cf4f12a123c05fcae83fc56d76442015cb8a39e9

Binary file resources/official_armmbed_example_badge.png has changed