zos: improve loop_count benchmark performance

After the poll call, the code updates all the event objects
in the array. Instead, use the integer value returned by poll
to limit the n

zos: improve loop_count benchmark performance

After the poll call, the code updates all the event objects
in the array. Instead, use the integer value returned by poll
to limit the number of epoll_event objects that are updated.
e.g. If poll returns 5, we know that we only need to update
5 event objects.

PR-URL: https://github.com/libuv/libuv/pull/1391
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

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zos: use proper prototype for epoll_init()

`int epoll_init()` declares a function that takes any number of
arguments, use `int epoll_init(void)` instead.

PR-URL: https://github.

zos: use proper prototype for epoll_init()

`int epoll_init()` declares a function that takes any number of
arguments, use `int epoll_init(void)` instead.

PR-URL: https://github.com/libuv/libuv/pull/1314
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: John Barboza <jbarboza@ca.ibm.com>
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>

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zos: make platform functional

Fix all functional test cases:

* use PLO compare,swap,store for atomic instruction
* do not use semaphore.h
* use xplink flag when linking

zos: make platform functional

Fix all functional test cases:

* use PLO compare,swap,store for atomic instruction
* do not use semaphore.h
* use xplink flag when linking
* scandir implementation
* nanosleep implementation
* add proctitle
* uv_loadavg
* uv_fs_event_init/start
* uv_fs_event_stop
* uv_exepath using __getthent syscall
* read free/total memory from mvs data areas
* uv_resident_set_memory implementation
* network interfaces implementation
* cpu_info implementation
* implement uv__hrtime
* make uv__fs_mkdtemp implementation
* epoll implementation for asyncio
* uv__fs_event_close implementation
* set process title
* read ancillary data that remains on queue
* ancillary data
* implement uv__fs_access
* use /dev/urandom for temporary directory name
* disable proctitle on zos completely

PR-URL: https://github.com/libuv/libuv/pull/1037
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>

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