e10ce184e4
Previously, there was a tiny chance that tickdelay(3) would return early or that it would fail to reinstate a previous alarm. - sys_setalarm(2) now returns TMR_NEVER instead of 0 for the time left if no previous alarm was set; - sys_setalarm(2) now also returns the current time, to allow the caller to determine whether it got an alarm notification for the alarm it set or for a previous alarm that has just gone off; - tickdelay(3) now makes use of these facilities. Change-Id: Id4f8fe19a61ca8574f43131964e6f0317f613f49
27 lines
742 B
C
27 lines
742 B
C
#include "syslib.h"
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/*
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* Ask the kernel to schedule a synchronous alarm for the caller, using either
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* an absolute or a relative number of clock ticks. Optionally return the time
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* left on the previous timer (TMR_NEVER if none was set) and the current time.
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*/
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int
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sys_setalarm2(clock_t exp_time, int abs_time, clock_t * time_left,
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clock_t * uptime)
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{
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message m;
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int r;
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m.m_lsys_krn_sys_setalarm.exp_time = exp_time; /* expiration time */
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m.m_lsys_krn_sys_setalarm.abs_time = abs_time; /* time is absolute? */
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if ((r = _kernel_call(SYS_SETALARM, &m)) != OK)
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return r;
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if (time_left != NULL)
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*time_left = m.m_lsys_krn_sys_setalarm.time_left;
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if (uptime != NULL)
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*uptime = m.m_lsys_krn_sys_setalarm.uptime;
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return OK;
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}
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