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LIBRARIES
WHAT'S NEW
Simplifying Authenticated Cloud Connectivity for Any Device.
How Wi-Fi and Cellular connectivity modules with ExpressLink can help create secure cloud connected devices. See the blog post.
Designing an energy efficient and cloud-connected IoT solution with CoAP.
A client/server, request/response, UDP-based protocol for efficiency and cloud compatibility. See the blog post.
Introducing FreeRTOS Kernel version 11.0.0:
A Major Release with Symmetric Multiprocessing (SMP) Support. See the blog post.
FreeRTOS Roadmap and Code Contribution process.
The FreeRTOS roadmap and code contribution process are now published here and on GitHub. See the blog post.
OPC-UA over TSN with FreeRTOS.
A development project to give applications consistent access to hardware TSN capabilities. See the blog post.

FreeRTOS-Plus-POSIX mqueue.h Implementation

[FreeRTOS-Plus-POSIX Overview]

NAME

    POSIX mqueue.h - message queues

SYNOPSIS

    #include "FreeRTOS_POSIX/mqueue.h"

DESCRIPTION

Symbolic Constants

Types

mqd_t

Below types are NOT defined in FreeRTOS-Plus-POSIX sys/types.h, but in sys/types.h

todo -- sys/types.h is not included in this header.

pthread_mutexattr_t
ssize_t

Below types are NOT defined in FreeRTOS-Plus-POSIX time.h, but in sys/types.h

struct timespec

todo -- size_t is not defined here, nor is stdlib.h included to simplify library dependency. Setup demo, and see how to include stdlib.h in a specific platform. Then update this line.

mq_attr structure

Structure Member Comment
long mq_flags Message queue flags.
long mq_maxmsg Maximum number of messages.
long mq_msgsize Maximum message size.
long mq_curmsgs Number of messages currently queued.

Function Prototypes

int mq_close( mqd_t mqdes );
int mq_getattr( mqd_t mqdes, struct mq_attr * mqstat );
mqd_t mq_open( const char * name, int oflag, mode_t mode, struct mq_attr * attr );
ssize_t mq_receive( mqd_t mqdes, char * msg_ptr, size_t msg_len, unsigned int * msg_prio );
int mq_send( mqd_t mqdes, const char * msg_ptr, size_t msg_len, unsigned msg_prio );
ssize_t mq_timedreceive( mqd_t mqdes, char * msg_ptr, size_t msg_len, unsigned * msg_prio, const struct timespec * abstime );
int mq_timedsend( mqd_t mqdes, const char * msg_ptr, size_t msg_len, unsigned msg_prio, const struct timespec * abstime );
int mq_unlink( const char * name );

Inclusion of the "FreeRTOS_POSIX/mqueue.h" header may make visible symbols defined in "FreeRTOS_POSIX/time.h" header.

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