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RTX Hard fault when trying to access osMailQId

Jay H

I want to send a mail item from Thread X to Thread Y. In that mail I want either Thread X or Thread Z's address, so that Thread Y knows where to send responses/data back to.

I wanted to include Thread X's or Z's osMailIdQ inside of the structure I'm mailing over to Thread Y. That way, when mail comes in, I can just use the rsvp address to send responses back to if needed.

This causes a hard fault.


typedef struct {
uint16_t id[10];
uint8_t len;
osMailQId target_address;
}mailStruct;

...


mail = (mailStruct*)osMailAlloc(ThreadY_request_mbox, osWaitForever);
bundle->id[0]=1;
bundle->id[1]=4;
bundle->id[2]=2;
bundle->len=3;
bundle->target_address = ThreadX_data_mbox;       //causes hard fault
osMailPut(ThreadY_request_mbox, bundle);

I'm not sure why it's causing a fault. Maybe for the same reason that the debugger always shows 0x0000000 for the mail box id? Maybe because in some parts of the OS like create thread osMailIdQ is a const? Precompiler stuff?

I have no idea. But I'd like to be able to get mail in from a thread and be able to dynamically know where to send it back to without having to use a switch of MailPut(X) MailPut(Y), MailPut(Z), etc.

Anyone?

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  • 0

    I'm curious here.

    You allocate an object that you typecast as type mailStruct* and assigns to a pointer named "mail".

    Then you suddenly starts to assign values using a pointer "bundle"? Shouldn't you use your pointer "mail"?

    Next thing - where is your code that makes sure that your osMailAlloc() actually allocates a struct that is (at least) the size of a mailStruct?

    IF osMailAlloc() allocates a too small struct, then your initial assigns to id[0], id[1], ... may succeed while the assign to target_address will be outside of the allocated struct.

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  • 0

    I'm curious here.

    You allocate an object that you typecast as type mailStruct* and assigns to a pointer named "mail".

    Then you suddenly starts to assign values using a pointer "bundle"? Shouldn't you use your pointer "mail"?

    Next thing - where is your code that makes sure that your osMailAlloc() actually allocates a struct that is (at least) the size of a mailStruct?

    IF osMailAlloc() allocates a too small struct, then your initial assigns to id[0], id[1], ... may succeed while the assign to target_address will be outside of the allocated struct.

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