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starting multiple threads; - support for a system worker thread has been removed; - the deadlock recovery thread has been replaced by a parameter to the worker_start() function; the number of worker threads has consequently been increased by one; - saving and restoring of global but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a message stored in the worker thread structure instead; - the PM lock has been removed; - the separate exec lock has been replaced by a lock on the VM process, which was already being locked for exec calls anyway; - PM_UNPAUSE is now processed as a postponed PM request, from a thread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
79 lines
3 KiB
C
79 lines
3 KiB
C
#ifndef __VFS_FPROC_H__
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#define __VFS_FPROC_H__
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#include "threads.h"
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#include <sys/select.h>
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#include <minix/safecopies.h>
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/* This is the per-process information. A slot is reserved for each potential
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* process. Thus NR_PROCS must be the same as in the kernel. It is not
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* possible or even necessary to tell when a slot is free here.
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*/
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#define LOCK_DEBUG 0
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EXTERN struct fproc {
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unsigned fp_flags;
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pid_t fp_pid; /* process id */
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endpoint_t fp_endpoint; /* kernel endpoint number of this process */
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struct vnode *fp_wd; /* working directory; NULL during reboot */
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struct vnode *fp_rd; /* root directory; NULL during reboot */
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struct filp *fp_filp[OPEN_MAX];/* the file descriptor table */
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fd_set fp_filp_inuse; /* which fd's are in use? */
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fd_set fp_cloexec_set; /* bit map for POSIX Table 6-2 FD_CLOEXEC */
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dev_t fp_tty; /* major/minor of controlling tty */
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int fp_blocked_on; /* what is it blocked on */
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int fp_block_callnr; /* blocked call if rd/wr can't finish */
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int fp_cum_io_partial; /* partial byte count if rd/wr can't finish */
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endpoint_t fp_task; /* which task is proc suspended on */
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endpoint_t fp_ioproc; /* proc no. in suspended-on i/o message */
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cp_grant_id_t fp_grant; /* revoke this grant on unsuspend if > -1 */
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uid_t fp_realuid; /* real user id */
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uid_t fp_effuid; /* effective user id */
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gid_t fp_realgid; /* real group id */
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gid_t fp_effgid; /* effective group id */
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int fp_ngroups; /* number of supplemental groups */
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gid_t fp_sgroups[NGROUPS_MAX];/* supplemental groups */
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mode_t fp_umask; /* mask set by umask system call */
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mutex_t fp_lock; /* mutex to lock fproc object */
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struct worker_thread *fp_worker;/* active worker thread, or NULL */
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void (*fp_func)(); /* handler function for pending work */
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message fp_msg; /* pending or active message from process */
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message fp_pm_msg; /* pending/active postponed PM request */
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char fp_name[PROC_NAME_LEN]; /* Last exec() */
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#if LOCK_DEBUG
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int fp_vp_rdlocks; /* number of read-only locks on vnodes */
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int fp_vmnt_rdlocks; /* number of read-only locks on vmnts */
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#endif
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vir_bytes text_size; /* text segment size of current process */
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vir_bytes data_size; /* data segment size of current process */
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} fproc[NR_PROCS];
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/* fp_flags */
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#define FP_NOFLAGS 00
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#define FP_SUSP_REOPEN 01 /* Process is suspended until the reopens are
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* completed (after the restart of a driver).
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*/
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#define FP_REVIVED 0002 /* Indicates process is being revived */
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#define FP_SESLDR 0004 /* Set if process is session leader */
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#define FP_PENDING 0010 /* Set if process has pending work */
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#define FP_EXITING 0020 /* Set if process is exiting */
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#define FP_PM_WORK 0040 /* Set if process has a postponed PM request */
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#define FP_SRV_PROC 0100 /* Set if process is a service */
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/* Field values. */
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#define NOT_REVIVING 0xC0FFEEE /* process is not being revived */
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#define REVIVING 0xDEEAD /* process is being revived from suspension */
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#define PID_FREE 0 /* process slot free */
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#endif /* __VFS_FPROC_H__ */
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