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This is specifically useful on graceful shutdown.
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If the -T option is passed, additionally to configuration test, configuration
files are output to stdout.
In the debug mode, configuration files are kept in memory and can be accessed
using a debugger.
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The new name is consistent with the ngx_proxy_protocol_write function.
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The new directive "proxy_protocol" toggles sending out PROXY protocol header
to upstream once connection is established.
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The function is now called ngx_parse_http_time(), and can be used by
any code to parse HTTP-style date and time. In particular, it will be
used for OCSP stapling.
For compatibility, a macro to map ngx_http_parse_time() to the new name
provided for a while.
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The b->pos points to the next symbol here.
Reported by ilexshen.
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When configured, an individual listen socket on a given address is
created for each worker process. This allows to reduce in-kernel lock
contention on configurations with high accept rates, resulting in better
performance. As of now it works on Linux and DragonFly BSD.
Note that on Linux incoming connection requests are currently tied up
to a specific listen socket, and if some sockets are closed, connection
requests will be reset, see https://lwn.net/Articles/542629/. With
nginx, this may happen if the number of worker processes is reduced.
There is no such problem on DragonFly BSD.
Based on previous work by Sepherosa Ziehau and Yingqi Lu.
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Overflow detection of the last octet might not work.
Reported by Sergey Polovko.
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Two mechanisms are implemented to make it possible to store pointers
in shared memory on Windows, in particular on Windows Vista and later
versions with ASLR:
- The ngx_shm_remap() function added to allow remapping of a shared memory
zone to the address originally used for it in the master process. While
important, it doesn't solve the problem by itself as in many cases it's
not possible to use the address because of conflicts with other
allocations.
- We now create mappings at the same address in all processes by starting
mappings at predefined addresses normally unused by newborn processes.
These two mechanisms combined allow to use shared memory on Windows
almost without problems, including reloads.
Based on the patch by Sergey Brester:
http://mailman.nginx.org/pipermail/nginx-devel/2015-April/006836.html
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The http and stream versions of this macro were identical.
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It was only needed by the just removed rtsig module.
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For example, this fixes the case when "proxy_cache_path" is specified
after "proxy_cache" that references it.
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This fixes compilation of various 3rd party modules when nginx is
configured with threads.
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Upstreams with the "zone" directive are kept in shared memory,
with a consistent view of all worker processes.
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Casting a "const char *" to "char *" doesn't work on older gcc versions.
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The new thread pools code uses spinlocks.
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Similar to ngx_http_file_cache_set_slot(), the last component of file->name
with a fixed length of 10 bytes, as generated in ngx_create_temp_path(), is
used as a source for the names of intermediate subdirectories with each one
taking its own part. Ensure that the sum of specified levels with slashes
fits into the length (ticket #731).
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Level hierarchy is pre-zeroed in ngx_pcalloc() of the surrounding ngx_path_t.
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Now we log a "zero size buf in chain writer" alert if we encounter a zero
sized buffer in ngx_chain_writer(), and skip the buffer.
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No functional changes.
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It's not needed for completed tasks queue since the previous change.
No functional changes.
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Example of usage:
error_log memory:16m debug;
This allows to configure debug logging with minimum impact on performance.
It's especially useful when rare crashes are experienced under high load.
The log can be extracted from a coredump using the following gdb script:
set $log = ngx_cycle->log
while $log->writer != ngx_log_memory_writer
set $log = $log->next
end
set $buf = (ngx_log_memory_buf_t *) $log->wdata
dump binary memory debug_log.txt $buf->start $buf->end
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Work around pthread_cond_destroy() and pthread_mutex_destroy() returning
EBUSY. A proper solution would be to ensure all threads are terminated.
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Behave like POSIX semaphores. If N worker threads are waiting for tasks,
at least that number of tasks should be allowed to be put into the queue.
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It's not needed for completed tasks queue.
No functional changes.
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