WebSVN – HelenOS – Diff – /trunk/uspace/libc/generic/time.c


/*
 * Copyright (c) 2006 Ondrej Palkovsky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/** @addtogroup libc
 * @{
 */
/** @file
 */
 
#include <sys/time.h>
#include <unistd.h>
#include <ipc/ipc.h>
#include <stdio.h>
#include <arch/barrier.h>
#include <unistd.h>
#include <atomic.h>
#include <futex.h>
#include <sysinfo.h>
#include <ipc/services.h>
 
#include <sysinfo.h>
#include <as.h>
#include <ddi.h>
 
/* Pointers to public variables with time */
struct {
    volatile sysarg_t seconds1;
    volatile sysarg_t useconds;
    volatile sysarg_t seconds2;
} *ktime = NULL;
 
 
/** POSIX gettimeofday
 *
 * The time variables are memory mapped(RO) from kernel, which updates
 * them periodically. As it is impossible to read 2 values atomically, we
 * use a trick: First read a seconds, then read microseconds, then
 * read seconds again. If a second elapsed in the meantime, set it to zero.
 * This provides assurance, that at least the
 * sequence of subsequent gettimeofday calls is ordered.
 */
int gettimeofday(struct timeval *tv, struct timezone *tz)
{
    void *mapping;
    sysarg_t s1, s2;
    sysarg_t rights;
    int res;
 
    if (!ktime) {
        mapping = as_get_mappable_page(PAGE_SIZE);
        /* Get the mapping of kernel clock */
        res = ipc_call_sync_3(PHONE_NS, IPC_M_AS_AREA_RECV,
            (sysarg_t) mapping, PAGE_SIZE, SERVICE_MEM_REALTIME, NULL,
            &rights, NULL);
        if (res) {
            printf("Failed to initialize timeofday memarea\n");
            _exit(1);
        }
        if (! (rights & AS_AREA_READ)) {
            printf("Received bad rights on time area: %X\n",
                   rights);
            as_area_destroy(mapping);
            _exit(1);
        }
        ktime = mapping;
    }
    if (tz) {
        tz->tz_minuteswest = 0;
        tz->tz_dsttime = DST_NONE;
    }
 
    s2 = ktime->seconds2;
    read_barrier();
    tv->tv_usec = ktime->useconds;
    read_barrier();
    s1 = ktime->seconds1;
    if (s1 != s2) {
        tv->tv_usec = 0;
        tv->tv_sec = s1 > s2 ? s1 : s2;
    } else
        tv->tv_sec = s1;
 
    return 0;
}
 
/** Wait unconditionally for specified number of microseconds */
void usleep(unsigned long usec)
{
    atomic_t futex = FUTEX_INITIALIZER;
 
    futex_initialize(&futex, 0);
    futex_down_timeout(&futex, usec, 0);
}
 
/** Wait unconditionally for specified number of seconds */
unsigned int sleep(unsigned int seconds)
{
    atomic_t futex = FUTEX_INITIALIZER;
 
    futex_initialize(&futex, 0);
   
    /* Sleep in 1000 second steps to support
       full argument range */
    while (seconds > 0) {
        unsigned int period = (seconds > 1000) ? 1000 : seconds;
   
        futex_down_timeout(&futex, period * 1000000, 0);
        seconds -= period;
    }
}
 
/** @}
 */
 

Rev 2141	Rev 2188
1	/*	1	/*
2	* Copyright (c) 2006 Ondrej Palkovsky	2	* Copyright (c) 2006 Ondrej Palkovsky
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	/** @addtogroup libc	29	/** @addtogroup libc
30	* @{	30	* @{
31	*/	31	*/
32	/** @file	32	/** @file
33	*/	33	*/
34		34
35	#include <sys/time.h>	35	#include <sys/time.h>
36	#include <unistd.h>	36	#include <unistd.h>
37	#include <ipc/ipc.h>	37	#include <ipc/ipc.h>
38	#include <stdio.h>	38	#include <stdio.h>
39	#include <arch/barrier.h>	39	#include <arch/barrier.h>
40	#include <unistd.h>	40	#include <unistd.h>
41	#include <atomic.h>	41	#include <atomic.h>
42	#include <futex.h>	42	#include <futex.h>
43	#include <sysinfo.h>	43	#include <sysinfo.h>
44	#include <ipc/services.h>	44	#include <ipc/services.h>
45		45
46	#include <sysinfo.h>	46	#include <sysinfo.h>
47	#include <as.h>	47	#include <as.h>
48	#include <ddi.h>	48	#include <ddi.h>
49		49
50	/* Pointers to public variables with time */	50	/* Pointers to public variables with time */
51	struct {	51	struct {
52	volatile sysarg_t seconds1;	52	volatile sysarg_t seconds1;
53	volatile sysarg_t useconds;	53	volatile sysarg_t useconds;
54	volatile sysarg_t seconds2;	54	volatile sysarg_t seconds2;
55	} *ktime = NULL;	55	} *ktime = NULL;
56		56
57		57
58	/** POSIX gettimeofday	58	/** POSIX gettimeofday
59	*	59	*
60	* The time variables are memory mapped(RO) from kernel, which updates	60	* The time variables are memory mapped(RO) from kernel, which updates
61	* them periodically. As it is impossible to read 2 values atomically, we	61	* them periodically. As it is impossible to read 2 values atomically, we
62	* use a trick: First read a seconds, then read microseconds, then	62	* use a trick: First read a seconds, then read microseconds, then
63	* read seconds again. If a second elapsed in the meantime, set it to zero.	63	* read seconds again. If a second elapsed in the meantime, set it to zero.
64	* This provides assurance, that at least the	64	* This provides assurance, that at least the
65	* sequence of subsequent gettimeofday calls is ordered.	65	* sequence of subsequent gettimeofday calls is ordered.
66	*/	66	*/
67	int gettimeofday(struct timeval tv, struct timezone tz)	67	int gettimeofday(struct timeval tv, struct timezone tz)
68	{	68	{
69	void *mapping;	69	void *mapping;
70	sysarg_t s1, s2;	70	sysarg_t s1, s2;
71	sysarg_t rights;	71	sysarg_t rights;
72	int res;	72	int res;
73		73
74	if (!ktime) {	74	if (!ktime) {
75	mapping = as_get_mappable_page(PAGE_SIZE);	75	mapping = as_get_mappable_page(PAGE_SIZE);
76	/* Get the mapping of kernel clock */	76	/* Get the mapping of kernel clock */
77	res = ipc_call_sync_3(PHONE_NS, IPC_M_AS_AREA_RECV,	77	res = ipc_call_sync_3(PHONE_NS, IPC_M_AS_AREA_RECV,
78	(sysarg_t) mapping, PAGE_SIZE, SERVICE_MEM_REALTIME, NULL,	78	(sysarg_t) mapping, PAGE_SIZE, SERVICE_MEM_REALTIME, NULL,
79	&rights, NULL);	79	&rights, NULL);
80	if (res) {	80	if (res) {
81	printf("Failed to initialize timeofday memarea\n");	81	printf("Failed to initialize timeofday memarea\n");
82	_exit(1);	82	_exit(1);
83	}	83	}
84	if (! (rights & AS_AREA_READ)) {	84	if (! (rights & AS_AREA_READ)) {
85	printf("Received bad rights on time area: %X\n",	85	printf("Received bad rights on time area: %X\n",
86	rights);	86	rights);
87	as_area_destroy(mapping);	87	as_area_destroy(mapping);
88	_exit(1);	88	_exit(1);
89	}	89	}
90	ktime = mapping;	90	ktime = mapping;
91	}	91	}
92	if (tz) {	92	if (tz) {
93	tz->tz_minuteswest = 0;	93	tz->tz_minuteswest = 0;
94	tz->tz_dsttime = DST_NONE;	94	tz->tz_dsttime = DST_NONE;
95	}	95	}
96		96
97	s2 = ktime->seconds2;	97	s2 = ktime->seconds2;
98	read_barrier();	98	read_barrier();
99	tv->tv_usec = ktime->useconds;	99	tv->tv_usec = ktime->useconds;
100	read_barrier();	100	read_barrier();
101	s1 = ktime->seconds1;	101	s1 = ktime->seconds1;
102	if (s1 != s2) {	102	if (s1 != s2) {
103	tv->tv_usec = 0;	103	tv->tv_usec = 0;
104	tv->tv_sec = s1 > s2 ? s1 : s2;	104	tv->tv_sec = s1 > s2 ? s1 : s2;
105	} else	105	} else
106	tv->tv_sec = s1;	106	tv->tv_sec = s1;
107		107
108	return 0;	108	return 0;
109	}	109	}
110		110
111	/** Wait unconditionally for specified microseconds */	111	/** Wait unconditionally for specified number of microseconds */
112	void usleep(unsigned long usec)	112	void usleep(unsigned long usec)
113	{	113	{
114	atomic_t futex = FUTEX_INITIALIZER;	114	atomic_t futex = FUTEX_INITIALIZER;
115		115
116	futex_initialize(&futex,0);	116	futex_initialize(&futex, 0);
117	futex_down_timeout(&futex, usec, 0);	117	futex_down_timeout(&futex, usec, 0);
118	}	118	}
-		119
-		120	/** Wait unconditionally for specified number of seconds */
-		121	unsigned int sleep(unsigned int seconds)
-		122	{
-		123	atomic_t futex = FUTEX_INITIALIZER;
-		124
-		125	futex_initialize(&futex, 0);
-		126
-		127	/* Sleep in 1000 second steps to support
-		128	full argument range */
-		129	while (seconds > 0) {
-		130	unsigned int period = (seconds > 1000) ? 1000 : seconds;
-		131
-		132	futex_down_timeout(&futex, period * 1000000, 0);
-		133	seconds -= period;
-		134	}
-		135	}
119		136
120	/** @}	137	/** @}
121	*/	138	*/
122		139

Subversion Repositories HelenOS

(root)/trunk/uspace/libc/generic/time.c – Rev 2141 → 2188