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If the value stored at the address old_addr is val, wakes num_wake threads waiting on the address old_addr, and enqueues num_move threads waiting on the address old_addr to now wait on the address new_addr. This can be used to avoid the thundering herd problem on wake. [14] [15] WAKE_OP(addr1, addr2, num1, num2, op, op_arg, cmp, cmp_arg)
In a SQL database, a record is typically called a "row". The introduction of granular (subset) locks creates the possibility for a situation called deadlock. Deadlock is possible when incremental locking (locking one entity, then locking one or more additional entities) is used. To illustrate, if two bank customers asked two clerks to obtain ...
Many computer systems measure time and date using Unix time, an international standard for digital timekeeping.Unix time is defined as the number of seconds elapsed since 00:00:00 UTC on 1 January 1970 (an arbitrarily chosen time based on the creation of the first Unix system), which has been dubbed the Unix epoch.
It alerts the client to wait for a final response. The message consists only of the status line and optional header fields, and is terminated by an empty line. As the HTTP/1.0 standard did not define any 1xx status codes, servers must not [ note 1 ] send a 1xx response to an HTTP/1.0 compliant client except under experimental conditions.
TCP delayed acknowledgment is a technique used by some implementations of the Transmission Control Protocol in an effort to improve network performance.In essence, several ACK responses may be combined into a single response, reducing protocol overhead.
In database systems, durability is the ACID property that guarantees that the effects of transactions that have been committed will survive permanently, even in cases of failures, [1] including incidents and catastrophic events.
One of Bomis's servers hosted all Wikipedia wikis; English and meta running on the php/mysql-based new software, all other languages on UseModWiki. Runs both the database and the web server on one machine. Phase IIIa: July 2002 – May 2003. Wikipedia gets own server, running English Wikipedia and after a bit meta, with rewritten PHP software.
The command that can be used on Solaris systems (prior to v11) to determine the time-wait interval is: ndd -get /dev/tcp tcp_time_wait_interval 60000 (60 seconds) is a common value. On FreeBSD systems this description and value can be checked by the command sysctl: [2] sysctl -d net.inet.tcp.msl sysctl net.inet.tcp.msl which gets the result: