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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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It's mostly dead code and the original idea of worker threads has been rejected.
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No functional changes.
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These are needed to detect overflows.
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Initial size as calculated from the number of elements may be bigger
than max_size. If this happens, make sure to set size to max_size.
Reported by Chris West.
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Previously, this function checked for connection local address existence
and returned error if it was missing. Now a new address is assigned in this
case making it possible to call this function not only for accepted connections.
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It appeared that the NGX_HAVE_AIO_SENDFILE macro was defined regardless of
the "--with-file-aio" configure option and the NGX_HAVE_FILE_AIO macro.
Now they are related.
Additionally, fixed one macro.
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This reduces layering violation and simplifies the logic of AIO preread, since
it's now triggered by the send chain function itself without falling back to
the copy filter. The context of AIO operation is now stored per file buffer,
which makes it possible to properly handle cases when multiple buffers come
from different locations, each with its own configuration.
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There was a typo in NGX_EACCES.
Reported by Goetz T. Fischer.
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The mtx->wait counter was not decremented if we were able to obtain the lock
right after incrementing it. This resulted in unneeded sem_post() calls,
eventually leading to EOVERFLOW errors being logged, "sem_post() failed
while wake shmtx (75: Value too large for defined data type)".
To close the race, mtx->wait is now decremented if we obtain the lock right
after incrementing it in ngx_shmtx_lock(). The result can become -1 if a
concurrent ngx_shmtx_unlock() decrements mtx->wait before the added code does.
However, that only leads to one extra iteration in the next call of
ngx_shmtx_lock().
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The use_temp_path http cache feature is now implemented using a separate temp
hierarchy in cache directory. Prefix-based temp files are no longer needed.
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If pre_tree_handler() returns NGX_DECLINED, the directory is ignored.
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The ctx->aio flag must be taken into account in the short path too.
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Thanks to Joe Bialek, Adam Zabrocki and Microsoft Vulnerability Research.
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Now, if the "path" parameter is NULL, ngx_create_temp_file() will use
file->name as a predefined file path prefix.
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The original check for NGX_AGAIN was surplus, since the function returns
only NGX_OK or NGX_ERROR. Now it looks similar to other places.
No functional changes.
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In 954867a2f0a6, we switched to using resolver node as the timer event data.
This broke debug event logging.
Replaced now unused ngx_resolver_ctx_t.ident with ngx_resolver_node_t.ident
so that ngx_event_ident() extracts something sensible when accessing
ngx_resolver_node_t as ngx_connection_t.
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In 954867a2f0a6, we switched to using resolver node as the
timer event data, so make sure we do not free resolver node
memory until the corresponding timer is deleted.
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No functional changes.
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