Removing unused tracking fields and functions.

The message tracking is unused since 1d84b9e4b459 commit.

This fixes the issue found by Coverity (CID 376263).

Router: broadcasting the SHM_ACK message to all process ports.

Changing router to application shared memory exchange protocol.

The application process needs to request the shared memory segment from the
router instead of the latter pushing the segment before se

Changing router to application shared memory exchange protocol.

The application process needs to request the shared memory segment from the
router instead of the latter pushing the segment before sending a request to
the application. This is required to simplify the communication between the
router and the application and to prepare the router for using the application
shared port and then the queue.

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Using plain shared memory for configuration pass.

There is no restrictions on configration size and using segmented shared memory
only doubles memory usage because to parse configration on router si

Using plain shared memory for configuration pass.

There is no restrictions on configration size and using segmented shared memory
only doubles memory usage because to parse configration on router side,
it needs to be 'plain' e. g. located in single continous memory buffer.

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Fixing multi-thread port write racing conditions.

Implementing the ability to cancel request before worker starts processing it.

Introducing mmap_handler to count references to shared memory.


"All problems in computer science can be
solved by another level of indirection"

Introducing mmap_handler to count references to shared memory.


"All problems in computer science can be
solved by another level of indirection"

Butler Lampson

Completion handlers for application response buffers executed after
sending the data to client. Application worker can be stopped right
after send response buffers to router. Worker stop causes removal
of all data structures for the worker.

To prevent shared memory segment unmap, need to count the number of
buffers which uses it. So instead of direct reference to shared
memory, need to reference to intermediate 'handler' structure with
use counter and pointer to shared memory.

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Supporting concurrent shared memory fd receive in router.

Two different router threads may send different requests to single
application worker. In this case shared memory fds from worker
to router

Supporting concurrent shared memory fd receive in router.

Two different router threads may send different requests to single
application worker. In this case shared memory fds from worker
to router will be send over 2 different router ports. These fds
will be received and processed by different threads in any order.

This patch made possible to add incoming shared memory segments in
arbitrary order. Additionally, array and memory pool are no longer
used to store segments because of pool's single threaded nature.

Custom array-like structure nxt_port_mmaps_t introduced.

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Request body read state implemented.

With specific timeout and buffer size settings.

Added basic port error handler.

New process port exchange changed. READY message type introduced.

Application process start request DATA message from router to master.
Master notifies router via NEW_PORT message after worker proce

New process port exchange changed. READY message type introduced.

Application process start request DATA message from router to master.
Master notifies router via NEW_PORT message after worker process become ready.

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Moved message size to nxt_port_recv_msg_t for convenience.

Store pointer to shared memory start in buf->parent.

nxt_port_mmap_t stored in arrays and it is unsafe to store
pointer to array element.

Shared memory structures and macros moved to separate heade

Store pointer to shared memory start in buf->parent.

nxt_port_mmap_t stored in arrays and it is unsafe to store
pointer to array element.

Shared memory structures and macros moved to separate header
file to be used by GO package.

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Using shared memory to send data via nxt_port.

Usage:
b = nxt_port_mmap_get_buf(task, port, size);
b->mem.free = nxt_cpymem(b->mem.free, data, size);
nxt_port_socket_write(task, port, NX

Using shared memory to send data via nxt_port.

Usage:
b = nxt_port_mmap_get_buf(task, port, size);
b->mem.free = nxt_cpymem(b->mem.free, data, size);
nxt_port_socket_write(task, port, NXT_PORT_MSG_DATA, -1, 0, b);

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