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Diffstat (limited to 'doc/mach.texi')
| -rw-r--r-- | doc/mach.texi | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/doc/mach.texi b/doc/mach.texi index 13e0927..93c5eae 100644 --- a/doc/mach.texi +++ b/doc/mach.texi @@ -4550,14 +4550,15 @@ whose control port was presented. The function @code{thread_switch} provides low-level access to the scheduler's context switching code. @var{new_thread} is a hint that implements hand-off scheduling. The operating system will attempt to -switch directly to the new thread (by passing the normal logic that +switch directly to the new thread (bypassing the normal logic that selects the next thread to run) if possible. Since this is a hint, it may be incorrect; it is ignored if it doesn't specify a thread on the same host as the current thread or if that thread can't be switched to -(i.e., not runnable or already running on another processor). In this -case, the normal logic to select the next thread to run is used; the -current thread may continue running if there is no other appropriate -thread to run. +(i.e., not runnable or already running on another processor or giving +a plainly invalid hint, such as @code{MACH_PORT_NULL}). In this case, +the normal logic to select the next thread to run is used; the current +thread may continue running if there is no other appropriate thread to +run. Options for @var{option} are defined in @file{mach/thread_switch.h} and specify the interpretation of @var{time}. The possible values for @@ -4568,8 +4569,9 @@ specify the interpretation of @var{time}. The possible values for No options, the time argument is ignored. @item SWITCH_OPTION_WAIT -The thread is blocked for the specified time. This can be aborted by -@code{thread_abort}. +The thread is blocked for the specified time (in milliseconds; +specifying @code{0} will wait for the next tick). This can be aborted +by @code{thread_abort}. @item SWITCH_OPTION_DEPRESS The thread's priority is depressed to the lowest possible value for the |