723e51327f
The main purpose of this patch is to fix handling of unpause calls from PM while another call is ongoing. The solution to this problem sparked a full revision of the threading model, consisting of a large number of related changes: - all active worker threads are now always associated with a process, and every process has at most one active thread working for it; - the process lock is always held by a process's worker thread; - a process can now have both normal work and postponed PM work associated to it; - timer expiry and non-postponed PM work is done from the main thread; - filp garbage collection is done from a thread associated with VFS; - reboot calls from PM are now done from a thread associated with PM; - the DS events handler is protected from starting multiple threads; - support for a system worker thread has been removed; - the deadlock recovery thread has been replaced by a parameter to the worker_start() function; the number of worker threads has consequently been increased by one; - saving and restoring of global but per-thread variables is now centralized in worker_suspend() and worker_resume(); err_code is now saved and restored in all cases; - the concept of jobs has been removed, and job_m_in now points to a message stored in the worker thread structure instead; - the PM lock has been removed; - the separate exec lock has been replaced by a lock on the VM process, which was already being locked for exec calls anyway; - PM_UNPAUSE is now processed as a postponed PM request, from a thread associated with the target process; - the FP_DROP_WORK flag has been removed, since it is no longer more than just an optimization and only applied to processes operating on a pipe when getting killed; - assignment to "fp" now takes place only when obtaining new work in the main thread or a worker thread, when resuming execution of a thread, and in the special case of exiting processes during reboot; - there are no longer special cases where the yield() call is used to force a thread to run. Change-Id: I7a97b9b95c2450454a9b5318dfa0e6150d4e6858
42 lines
966 B
C
42 lines
966 B
C
#ifndef __VFS_WORKERS_H__
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#define __VFS_WORKERS_H__
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#include <minix/mthread.h>
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#define thread_t mthread_thread_t
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#define mutex_t mthread_mutex_t
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#define cond_t mthread_cond_t
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#define attr_t mthread_attr_t
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#define threads_init mthread_init
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#define yield mthread_yield
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#define yield_all mthread_yield_all
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#define mutex_init mthread_mutex_init
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#define mutex_destroy mthread_mutex_destroy
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#define mutex_lock mthread_mutex_lock
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#define mutex_trylock mthread_mutex_trylock
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#define mutex_unlock mthread_mutex_unlock
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#define cond_init mthread_cond_init
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#define cond_destroy mthread_cond_destroy
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#define cond_wait mthread_cond_wait
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#define cond_signal mthread_cond_signal
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struct fproc;
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struct worker_thread {
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thread_t w_tid;
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mutex_t w_event_mutex;
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cond_t w_event;
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struct fproc *w_fp;
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message w_msg;
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int w_err_code;
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message *w_fs_sendrec;
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message *w_drv_sendrec;
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endpoint_t w_task;
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struct dmap *w_dmap;
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struct worker_thread *w_next;
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};
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#endif
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