... Linux虽然符合POSIX1003.1b关于实时扩展部分的标准,例如:支持SCHED_FIFO和SCHED_RR实时调度策略,锁内存机制(memory LOCking),实时信号等功能,但是由于其最初的设计目标为通用分时操作系统,因此作为一个实时操作系统,Linux仍然存在如下缺陷:
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Locking The Memory 锁上记忆
locking physical memory 锁定物理内存
File locking and memory-mapped files 文件锁定和内存映射文件
Memory locking is a way to ensure that a process stays in main memory and is exempt from paging.
内存锁定是一种保证某进程驻留在内存而不需换页的方法。
This memory is used by database level tasks such as backup/restore, locking, and SQL executions.
这种内存用于数据库级的任务,例如备份/恢复、锁定和 SQL 的执行。
However, even under the newly proposed memory model, double-checked locking will not work.
尽管如此,即使是在新提议的内存模型中,双重检查锁定也是无效的。
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